2024年1月13日发(作者：)
C程序设计(第三版)谭浩强 清华大学出版社 课后习题答案
第一章
1.5
# include
void main()
{
printf("* * * * * * * * *n Very good!n* * * * * * * * *n");
}
1.6
（法一）
#include
main()
{
int a,b,c,max;
scanf("%d,%d,%d",&a,&b,&c);
max=(a>b)?a:b;
max=(max>c)?max:c;
printf("max=%dn",max);
}
（法二）
main()
{
int a,b,c,max;
scanf("%d,%d,%d",&a,&b,&c);
if(a>b&&a>c)
max=a;
else if (b>c)
max=b;
else
max=c;
printf("max=%dn",max);
}
（法三）
# include
void main()
{
int max(int x,int y,int z);
int a,b,c,d;
scanf("%d,%d,%d",&a,&b,&c);
d=max(a,b,c);
printf("max=%dn",d);
}
int max(int x,int y,int z)
{
int A,B;
if(x>y) A=x;
else A=y;
if(z>A) B=z;
else B=A;
return(B);
}
第三章
3.3
(1)(10)10=(12)8=(a)16
(2)(32)10=(40)8=(20)16
(3)(75)10=(113)8=(4b)16
(4)(-617)10=(176627)8=(fd97)16
(5)(-111)10=(177621)8=(ff91)16
(6)(2483)10=(4663)8=(963)16
(7)(-28654)10=(110022)8=(9012)16
(8)(21003)10=(51013)8=(520b)16
3.6
aabb (8)cc (8)abc
(7)AN
3.7
main()
{char c1='C',c2='h',c3='i',c4='n',c5='a';
c1+=4, c2+=4, c3+=4, c4+=4, c5+=4;
printf("%c%c%c%c%cn",c1,c2,c3,c4,c5);
}
3.8
main()
{int c1,c2;
c1=97;c2=98;
printf("%c %c",c1,c2);
}
3.9
(1)=2.5
(2)=3.5
3.10
9,11,9,10
3.12
(1)24 (2)10 (3)60 (4)0 (5)0 (6)0
第四章
4.4
main()
{int a,b,c;
long int u,n;
float x,y,z;
char c1,c2;
a=3;b=4;c=5;
x=1.2;y=2.4;z=-3.6;
u=51274;n=128765;
c1='a';c2='b';
printf("n");
printf("a=%2d b=%2d c=%2dn",a,b,c);
printf("x=%8.6f,y=%8.6f,z=%9.6fn",x,y,z);
printf("x+y=%5.2f y+z=%5.2f z+x=%5.2fn",x+y,y+z,z+x);
printf("u=%6ld n=%9ldn",u,n);
printf("c1='%c'or %d(ASCII)n",c1,c1);
printf("c2='%c'or %d(ASCII)n",c2,c2);
}
4.5
57
5 7
67.856400,-789.123962
67.856400,-789.123962
67.86 -789.12,67.856400,-789.123962,67.856400,-789.123962
6.785640e+001,-7.89e+002
A,65,101,41
1234567,4553207,d687
65535,177777,ffff,-1
COMPUTER, COM
4.6
a=3 b=7/
x=8.5 y=71.82/
c1=A c2=a/
4.7
10 20Aa1.5 -3.75 +1.4,67.8/
(空3)10(空3)20Aa1.5(空1)-3.75(空1)(随意输入一个数），67.8回车
4.8
main()
{float pi,h,r,l,s,sq,sv,sz;
pi=3.1415926;
printf("input r,hn");
scanf("%f,%f",&r,&h);
l=2*pi*r;
s=r*r*pi;
sq=4*pi*r*r;
sv=4.0/3.0*pi*r*r*r;
sz=pi*r*r*h;
printf("l=%6.2fn",l);
printf("s=%6.2fn",s);
printf("sq=%6.2fn",sq);
printf("vq=%6.2fn",sv);
printf("vz=%6.2fn",sz);
}
4.9
main()
{float c,f;
scanf("%f",&f);
c=(5.0/9.0)*(f-32);
printf("c=%5.2fn",c);
}
4.10
#include"stdio.h"
main()
{char c1,c2;
scanf("%c,%c",&c1,&c2);
putchar(c1);
putchar(c2);
printf("n");
printf("%c%cn",c1,c2);
}
第五章
5.3
(1)0 (2)1 (3)1 (4)0 (5)1
5.4
main()
{int a,b,c;
scanf("%d,%d,%d",&a,&b,&c);
if(a if(b printf("max=%dn",c); else printf("max=%dn",b); else if(a printf("max=%dn",c); else printf("max=%dn",a); } main() {int a,b,c,temp,max; scanf("%d,%d,%d",&a,&b,&c); temp=(a>b)?a:b; max=(c>temp)?c:temp; printf("max=%d",max); } 5.5 main() {int x,y; scanf("%d",&x); if(x<1)y=x; else if(x<10)y=2*x-1; else y=3*x-11; printf("y=%d",y); } 5.6 main() {int score,temp,logic; char grade; logic=1; while(logic) {scanf("%d",&score); if(score>=0&&score<=100)logic=0; } if(score==100) temp=9; else temp=(score-score%10)/10; switch(temp) {case 9:grade='A';break; case 8:grade='B';break; case 7:grade='C';break; case 6:grade='D';break; case 5: case 4: case 3: case 2: case 1: case 0:grade='E'; } printf"score=%d,grade=%c",score,grade); } 5.7 main() {long int num; int indiv,ten,hundred,thousand,ten_thousand,place; scanf("%ld",&num); if(num>9999) place=5; else if(num>999) place=4; else if(num>99) place=3; else if(num>9) place=2; else place=1; printf("place=%dn",place); ten_thousand=num/10000; thousand=(num-ten_thousand*10000)/1000; hundred=(num-ten_thousand*10000-thousand*1000)/100; ten=(num-ten_thousand*10000-thousand*1000-hundred*100)/10; indiv=num-ten_thousand*10000-thousand*1000-hundred*100-ten*10; switch(place) {case 5:printf("%d,%d,%d,%d,%dn",ten_thousand,thousand,hundred,ten,indiv); printf("%d,%d,%d,%d,%dn",indiv,ten,hundred,thousand,ten_thousand); break; case 4:printf("%d,%d,%d,%dn",thousand,hundred,ten,indiv); printf("%d,%d,%d,%dn",indiv,ten,hundred,thousand); break; case 3:printf("%d,%d,%dn",hundred,ten,indiv); printf("%d,%d,%dn",indiv,ten,hundred); break; case 2:printf("%d,%dn",ten,indiv); printf("%d,%dn",indiv,ten); break; case 1:printf("%dn",indiv); printf("%dn",indiv); } } 5.8 main() {long i; float bonus,bon1,bon2,bon4,bon6,bon10; bon1=100000*0.1; bon2=bon1+100000*0.075; bon4=bon2+200000*0.05; bon6=bon4+200000*0.03; bon10=bon6+400000*0.015; scanf("%ld",&i); if(i<=1e5)bonus=i*0.1; else if(i<=2e5)bonus=bon1+(i-100000)*0.075; else if(i<=4e5)bonus=bon2+(i-200000)*0.05; else if(i<=6e5)bonus=bon4+(i-400000)*0.03; else if(i<=1e6)bonus=bon6+(i-600000)*0.015; else bonus=bon10+(i-1000000)*0.01; printf("bonus=%10.2f",bonus); } main() {long i; float bonus,bon1,bon2,bon4,bon6,bon10; int branch; bon1=100000*0.1; bon2=bon1+100000*0.075; bon4=bon2+200000*0.05; bon6=bon4+200000*0.03; bon10=bon6+400000*0.015; scanf("%ld",&i); branch=i/100000; if(branch>10)branch=10; switch(branch) {case 0:bonus=i*0.1;break; case 1:bonus=bon1+(i-100000)*0.075;break; case 2: case 3:bonus=bon2+(i-200000)*0.05;break; case 4: case 5:bonus=bon4+(i-400000)*0.03;break; case 6: case 7 case 8: case 9:bonus=bon6+(i-600000)*0.015;break; case 10:bonus=bon10+(i-1000000)*0.01; } printf("bonus=%10.2f",bonus); } 4.9 main() {int t,a,b,c,d; scanf("%d,%d,%d,%d",&a,&b,&c,&d); if(a>b){t=a;a=b;b=t;} if(a>c){t=a;a=c;c=t;} if(a>d){t=a;a=d;d=t;} if(b>c){t=b;b=c;c=t;} if(b>d){t=b;b=d;d=t;} if(c>d){t=c;c=d;d=t;} printf("%d %d %d %dn",a,b,c,d); } 5.10 main() {int h=10; float x,y,x0=2,y0=2,d1,d2,d3,d4; scanf("%f,%f",&x,&y); d1=(x-x0)*(x-x0)+(y-y0)*(y-y0); d2=(x-x0)*(x-x0)+(y+y0)*(y+y0); d3=(x+x0)*(x+x0)+(y-y0)*(y-y0); d4=(x+x0)*(x+x0)+(y+y0)*(y+y0); if(d1>1&&d2>1&&d3>1&&d4>1)h=0; printf("h=%d",h); } 第六章 循环控制 6.1 main() {int a,b,num1,num2,temp; scanf("%d,%d",&num1,&num2); if(num1 a=num1;b=num2; while(b!=0) {temp=a%b; a=b; b=temp;} printf("%dn",a); printf("%dn",num1*num2/a); } 6.2 #include"stdio.h" main() {char c; int letters=0,space=0,digit=0,other=0; while((c=getchar())!='n') {if(c>='a'&&c<='z'||c>='A'&&c<='Z') letters++; else if(c==' ')space++; else if(c>='0'&&c<='9')digit++; else other++; } printf("letters=%dnspace=%dndigit=%dnother=%dn",letters,space,digit,other); } 6.3 main() {int a,n,count=1,sn=0,tn=0; scanf("%d,%d",&a,&n); while(count<=n) {tn+=a; sn+=tn; a*=10; ++count; } printf("a+aa+aaa+...=%dn",sn); } 6.4 main() {float n,s=0,t=1; for(n=1;n<=20;n++) {t*=n; s+=t; } printf("s=%en",s); } 6.5 main() {int N1=100,N2=50,N3=10; float k; float s1=0,s2=0,s3=0; for(k=1;k<=N1;k++)s1+=k; for(k=1;k<=N2;k++)s2+=k*k; for(k=1;k<=N3;k++)s3+=1/k; printf("s=%8.2fn",s1+s2+s3); } 6.6 main() {int i,j,k,n; for(n=100;n<1000;n++) {i=n/100; j=n/10-i*10; k=n%10; if(i*100+j*10+k==i*i*i+j*j*j+k*k*k) printf("n=%dn",n); } } 6.7 #define M 1000 main() {int k0,k1,k2,k3,k4,k5,k6,k7,k8,k9; int i,j,n,s; for(j=2;j<=M;j++) {n=0; s=j; for(i=1;i {if((j%i)==0) {n++; s=s-i; switch(n) {case 1:k0=i;break; case 2:k1=i;break; case 3:k2=i;break; case 4:k3=i;break; case 5:k4=i;break; case 6:k5=i;break; case 7:k6=i;break; case 8:k7=i;break; case 9:k8=i;break; case 10:k9=i;break; } } } if(s==0) {printf("j=%dn",j); if(n>1)printf("%d,%d",k0,k1); if(n>2)printf(",%d",k2); if(n>3)printf(",%d",k3); if(n>4)printf(",%d",k4); if(n>5)printf(",%d",k5); if(n>6)printf(",%d",k6); if(n>7)printf(",%d",k7); if(n>8)printf(",%d",k8); if(n>9)printf(",%dn",k9); } } } main() {static int k[10]; int i,j,n,s; for(j=2;j<=1000;j++) {n=-1; s=j; for(i=1;i {if((j%i)==0) {n++; s=s-i; k[n]=i; } } if(s==0) {printf("j=%dn",j); for(i=0;i printf("%d,",k[i]); printf("%dn",k[n]); } } } 6.8 main() {int n,t,number=20; float a=2;b=1;s=0; for(n=1;n<=number;n++) {s=s+a/b; t=a,a=a+b,b=t; } printf("s=%9.6fn",s); } 6.9 main() {float sn=100.0,hn=sn/2; int n; for(n=2;n<=10;n++) {sn=sn+2*hn; hn=hn/2; } printf("sn=%fn",sn); printf("hn=%fn",hn); } 6.10 main() {int day,x1,x2; day=9; x2=1; while(day>0) {x1=(x2+1)*2; x2=x1; day--; } printf("x1=%dn",x1); } 6.11 #include"math.h" main() {float a,xn0,xn1; scanf("%f",&a); xn0=a/2; xn1=(xn0+a/xn0)/2; do {xn0=xn1; xn1=(xn0+a/xn0)/2; } while(fabs(xn0-xn1)>=1e-5); printf("a=%5.2fn,xn1=%8.2fn",a,xn1); } 6.12 #include"math.h" main() {float x,x0,f,f1; x=1.5; do {x0=x; f=((2*x0-4)*x0+3)*x0-6; f1=(6*x0-8)*x0+3; x=x0-f/f1; } while(fabs(x-x0)>=1e-5); printf("x=%6.2fn",x); } 6.13 #include"math.h" main() {float x0,x1,x2,fx0,fx1,fx2; do {scanf("%f,%f",&x1,&x2); fx1=x1*((2*x1-4)*x1+3)-6; fx2=x2*((2*x2-4)*x2+3)-6; } while(fx1*fx2>0); do {x0=(x1+x2)/2; fx0=x0*((2*x0-4)*x0+3)-6; if((fx0*fx1)<0) {x2=x0; fx2=fx0; } else {x1=x0; fx1=fx0; } } while(fabs(fx0)>=1e-5); printf("x0=%6.2fn",x0); } 6.14 main() {int i,j,k; for(i=0;i<=3;i++) {for(j=0;j<=2-i;j++) printf(" "); for(k=0;k<=2*i;k++) printf("*"); printf("n"); } for(i=0;i<=2;i++) {for(j=0;j<=i;j++) printf(" "); for(k=0;k<=4-2*i;k++) printf("*"); printf("n"); } } 6.15 main() {char i,j,k; for(i='x';i<='z';i++) for(j='x';j<='z';j++) {if(i!=j) for(k='x';k<='z';k++) {if(i!=k&&j!=k) {if(i!='x'&&k!='x'&&k!='z') printf("na--%ctb--%ctc--%cn",i,j,k); } } } } 第七章 数组 7.1 #include #define N 101 main() { int i,j,line,a[N]; for (i=2;i for (i=2;i for (j=i+1;j {if(a[i]!=0 && a[j]!=0) if (a[j]%a[i]==0) a[j]=0; } printf("n"); for (i=2,line=0;i { if(a[i]!=0) { printf("%5d",a[i]); line++; } if(line==10) { printf("n"); line=0; } } } 7.2 #define N 10 main() {int i,j,min,temp,a[N]; for(i=0;i scanf("%d",&a[i]); for(i=0;i {min=i; for(j=i+1;j if(a[min]>a[j])min=j; temp=a[i]; a[i]=a[min]; a[min]=temp; } for(i=0;i printf("%5d",a[i]); } 7.3 main() {float a[3][3],sum; int i,j; for(i=0;i<3;i++) for(j=0;j<3;j++) {scanf("%f",&sum); a[i][j]=sum; } for(i=0;i<3;i++) sum=sum+a[i][i]; printf("sum=%f",sum); } 7.4 main() {int a[11]={1,4,6,9,13,16,19,28,40,100}; int temp1,temp2,number, end,i,j; scanf("%d",&number); end=a[9]; if(number>end) a[10]=number; else {for(i=0;i<10;i++) {if(a[i]>number) {temp1=a[i]; a[i]=number; for(j=i+1;j<11;j++) {temp2=a[j]; a[j]=temp1; temp1=temp2; } break; } } } for(i=0;i<11;i++) printf("%6d",a[i]); } 7.5 #define N 5 main() {int a[N]={8,6,5,4,1},i,temp; for(i=0;i {temp=a[i]; a[i]=a[N-i-1]; a[N-i-1]=temp; } for(i=0;i printf("%4d",a[i]); } 7.6 #define N 11 main() {int i,j,a[N][N]; for(i=1;i {a[i][i]=1; a[i][1]=1; } for(i=3;i for(j=2;j a[i][j]=a[i-1][j-1]+a[i-1][j]; for(i=1;i {for(j=1;j<=i;j++) printf("%6d",a[i][j]); printf("n"); } } 7.7 main() {int a[16][16],i,j,k,p,m,n; p=1; while(p==1) {scanf("%d",&n); if((n!=0)&&(n<=15)&&(n%2!=0))p=0; } for(i=1;i<=n;i++) for(j=1;j<=n;j++) a[i][j]=0; j=n/2+1; a[1][j]=1; for(k=2;k<=n*n;k++) {i=i-1; j=j+1; if((i<1)&&(j>n)) {i=i+2; j=j-1; } else {if(i<1)i=n; if(j>n)j=1; } if(a[i][j]==0)a[i][j]=k; else {i=i+2; j=j-1; a[i][j]=k; } } for(i=1;i<=n;i++) {for(j=1;j<=n;j++) printf("%3d",a[i][j]); printf("n"); } } 7.8 #define N 10 #define M 10 main() {int i,j,k,m,n,flag1,flag2,a[N][M],max,maxi,maxj; scanf("%d,%d",&n,&m); for(i=0;i for(j=0;j scanf("%d",&a[i][j]); flag2=0; for(i=0;i {max=a[i][0]; for(j=0;j if(max {max=a[i][j]; maxj=j; } for(k=0,flag1=1;k if(max>a[k][maxj])flag1=0; if(flag1) { printf("na[%d][%d]=%dn",i,maxj,max); flag2=1; } } if(!flag2) printf("NOT"); } 7.9 #include #define N 15 main() {int i,j,number,top,bott,min,loca,a[N],flag; char c; for(i=0;i<=N;i++) scanf("%d",&a[i]); flag=1; while(flag) {scanf("%d",&number); loca=0; top=0; bott=N-1; if((number loca=-1; while((loca==0)&&(top<=bott)) {min=(bott+top)/2; if(number==a[min]) {loca=min; printf("number=%d,loca=%dn",number,loca+1); } else if(number bott=min-1; else top=min+1; } if(loca==0||loca==-1) printf("%d not in tablen",number); printf("continue Y/N or y/nn"); c=getchar(); if(c=='N'||c=='n')flag=0; } } 7.10 main() {int i,j,uppn,lown,dign,span,othn; char text[3][80]; uppn=lown=dign=span=othn=0; for(i=0;i<3;i++) {gets(text[i]); for(j=0;j<80&&text[i][j]!='0';j++) {if(text[i][j]>='A'&&text[i][j]<='Z') uppn++; else if(text[i][j]>='a'&&text[i][j]<='z') lown++; else if(text[i][j]>='0'&&text[i][j]<='9') dign++; else if(text[i][j]==' ') span++; else othn++; } } for(i=0;i<3;i++) printf("%sn",text[i]); printf("uppn=%dn",uppn); printf("lown=%dn",lown); printf("dign=%dn",dign); printf("span=%dn",span); printf("othn=%dn",othn); } 7.11 main() {static char a[5]={'*','*','*','*','*'}; int i,j,k; char space=' '; for(i=0;i<=5;i++) {printf("n"); for(j=1;j<=3*i;j++) printf("%1c",space); for(k=0;k<=5;k++) printf("%3c",a[k]); } } 7.12 #include main() {int i,n; char ch[80],tran[80]; gets(ch); i=0; while(ch[i]!='0') {if((ch[i]>='A')&&(ch[i]<='Z')) tran[i]=26+64-ch[i]+1+64; else if((ch[i]>='a')&&(ch[i]<='z')) tran[i]=26+96-ch[i]+1+96; else tran[i]=ch[i]; i++; } n=i; for(i=0;i putchar(tran[i]); } 7.13 main() {char s1[80],s2[40]; int i=0,j=0; scanf("%s",s1); scanf("%s",s2); while(s1[i]!='0')i++; while(s2[j]!='0')s1[i++]=s2[j++]; s1[i]='0'; printf("s=%sn",s1); } 7.14 #include main() {int i,resu; char s1[100],s2[100]; gets(s1); gets(s2); i=0; while((s1[i]==s2[i])&&(s1[i]!='0'))i++; if(s1[i]=='0'&&s2[i]=='0')resu=0; else resu=s1[i]-s2[i]; printf("s1=%s,s2=%s,resu=%dn",s1,s2,resu); } 7.15 #include"stdio.h" main() {char from[80],to[80];; int i; scanf("%s",from); for(i=0;i<=strlen(from);i++) to[i]=from[i]; printf("%sn",to); } 第八章 8.1 hcf(u,v) int u,v; {int a,b,t,r; if(u>v){t=u;u=v;v=t;} a=u;b=v; while((r=b%a)!=0) {b=a;a=r;} return(a); } lcd(u,v,h) int u,v,h; {return(u*v/h);} main() {int u,v,h,l; scanf("%d,%d",&u,&v); h=hcf(u,v); printf("H.C.F=%dn",h); l=lcd(u,v,h); printf("L.C.D=%dn",l); } 8.2 #include"math.h" float x1,x2,disc,p,q; greater_than_zero(a,b) float a,b; {x1=(-b+sqrt(disc))/(2*a); x2=(-b-sqrt(disc))/(2*a); } equal_to_zero(a,b) flaot a,b; {x1=x2=-b/(2*a);} smaller_than_zero(a,b) float a,b; {p=-b/(2*a); q=sqrt(-disc)/(2*a); } main() {float a,b,c; scanf("%f,%f,%f",&a,&b,&c); disc=b*b-4*a*c; if(fabs(disc)<=1e-5) {equal_to_zero(a,b); printf("x1=%5.2ftx2=%5.2fn",x1,x2); } else if(disc>0) {greater_than_zero(a,b); printf("x1=%5.2ftx2=%5.2fn",x1,x2); } else {smaller_than_zero(a,b); printf("x1=%5.2f+%5.2fitx2=%5.2f-%5.2fin",p,q,p,q); } } 8.3 main() {int number; scanf("%d",&number); if(prime(number)) printf("yes"); else printf("no"); } int prime(number) int number; {int flag=1,n; for(n=2;n if(number%n==0) flag=0; return(flag); } 8.4 #define N 3 int array[N][N]; convert(array) int array[3][3]; {int i,j,t; for(i=0;i for(j=i+1;j {t=array[i][j]; array[i][j]=array[j][i]; array[j][i]=t; } } main() {int i,j; for(i=0;i for(j=0;j scanf("%d",&array[i][j]); convert(array); for(i=0;i {printf("n"); for(j=0;j printf("%5d",array[i][j]); } } 8.5 main() {char str[100]; scanf("%s",str); inverse(str); printf("%sn",str); } inverse(str) char str[]; {char t; int i,j; for(i=0,j=strlen(str);i {t=str[i]; str[i]=str[j-1]; str[j-1]=t; } } 8.6 char concate(str1,str2,str) char str1[],str2[],str[]; {int i,j; for(i=0;str1[i]!='0';i++) str[i]=str1[i]; for(j=0;str2[j]!='0';j++) str[i+j]=str2[j]; str[i+j]='0'; } main() {char s1[100],s2[100],s[100]; scanf("%s",s1); scanf("%s",s2); concate(s1,s2,s); printf("ns=%s",s); } 8.7 main() {char str[80],c[80]; void cpy(); gets(str); cpy(str,c); printf("n%sn",c); } void cpy(s,c) char s[],c[]; {int i,j; for(i=0,j=0;s[i]!='0';i++) if(s[i]=='a'||s[i]=='A'||s[i]=='e'||s[i]=='E'||s[i]=='i'|| s[i]=='I'||s[i]=='o'||s[i]=='O'||s[i]=='u'||s[i]=='U') {c[j]=s[i];j++;} c[j]='0'; } 8.8 main() {char str[80]; scanf("%s",str); insert(str); } insert(str) char str[]; {int i; for(i=strlen(str);i>0;i--) {str[i*2]=str[i]; str[i*2-1]=' '; } printf("%sn",str); } 8.9 int alph,digit,space,others; main() {char text[80]; gets(text); alph=0,digit=0,space=0,others=0; count(text); printf("nalph=%d,digit=%d,space=%d,others=%dn",alph,digit,space,others); } count(str) char str[]; {int i; for(i=0;str[i]!='0';i++) if((str[i]>='a'&&str[i]<='z')||(str[i]>='A'&&str[i]<='Z')) alph++; else if(str[i]>='0'&&str[i]<='9') digit++; else if(strcmp(str[i],' ')==0) space++; else others++; } 8.10 int alph(c) char c; {if((c>='a'&&c<='z')||(c>='A'&&c<='Z')) return(1); else return(0); } int longest(string) char string[]; {int len=0,i,length=0,flag=1,place,point; for(i=0;i<=strlen(string);i++) if(alph(string[i])) if(flag) {point=i; flag=0; } else len++; else {flag=1; if(len>length) {length=len; place=point; len=0; } } return(place); } main() {int i; char line[100]; gets(line); for(i=longest(line);alph(line[i]);i++) printf("%c",line[i]); printf("n"); } 8.11 #define N 10 char str[N]; main() {int i,flag; for(flag=1;flag==1;) {scanf("%s",str); if(strlen(str)>N) printf("input error"); else flag=0; } sort(str); for(i=0;i printf("%c",str[i]); } sort(str) char str[N]; {int i,j; char t; for(j=1;j for(i=0;(i if(str[i]>str[i+1]) {t=str[i]; str[i]=str[i+1]; str[i+1]=t; } } 8.12 #include float solut(a,b,c,d) float a,b,c,d; {float x=1,x0,f,f1; do {x0=x; f=((a*x0+b)*x0+c)*x0+d; f1=(3*a*x0+2*b)*x0+c; x=x0-f/f1; } while(fabs(x-x0)>=1e-5); return(x); } main() {float a,b,c,d; scanf("%f,%f,%f,%f",&a,&b,&c,&d); printf("x=%10.7fn",solut(a,b,c,d)); } 8.13 main() {int x,n; float p(); scanf("%d,%d",&n,&x); printf("P%d(%d)=%10.2fn",n,x,p(n,x)); } float p(tn,tx) int tn,tx; {if(tn==0) return(1); else if(tn==1) return(tx); else return(((2*tn-1)*tx*p((tn-1),tx)-(tn-1)*p((tn-2),tx))/tn); } 8.14 #define N 10 #define M 5 float score[N][M]; float a_stu[N],a_cor[M]; main() {int i,j,r,c; float h; float s_diff(); float highest(); r=0; c=1; input_stu(); avr_stu(); avr_cor(); printf("n number class 1 2 3 4 5 avr"); for(i=0;i {printf("nNO%2d",i+1); for(j=0;j printf("%8.2f",score[i][j]); printf("%8.2f",a_stu[i]); } printf("nclassavr"); for(j=0;j printf("%8.2f",a_cor[j]); h=highest(&r,&c); printf("nn%8.2f %d %dn",h,r,c); printf("n %8.2fn",s_diff()); } input_stu() {int i,j; float x; for(i=0;i {for(j=0;j {scanf("%f",&x); score[i][j]=x; } } } avr_stu() {int i,j; float s; for(i=0;i {for(j=0,s=0;j s+=score[i][j]; a_stu[i]=s/5.0; } } avr_cor() {int i,j; float s; for(j=0;j {for(i=0,s=0;i s+=score[i][j]; a_cor[j]=s/(float)N; } } float highest(r,c) int *r,*c; {float high; int i,j; high=score[0][0]; for(i=0;i for(j=0;j if(score[i][j]>high) {high=score[i][j]; *r=i+1; *c=j+1; } return(high); } float s_diff() {int i,j; float sumx=0.0,sumxn=0.0; for(i=0;i {sumx+=a_stu[i]*a_stu[i]; sumxn+=a_stu[i]; } return(sumx/N-(sumxn/N)*(sumxn/N)); } 8.15 #include #define N 10 void input_e(num,name) int num[]; char name[N][8]; {int i; for(i=0;i {scanf("%d",&num[i]); gets(name[i]); } } void sort(num,name) int num[]; char name[N][8]; {int i,j,min,temp1; char temp2[8]; for(i=0;i {min=i; for(j=i;j if(num[min]>num[j])min=j; temp1=num[i]; num[i]=num[min]; num[min]=temp1; strcpy(temp2,name[i]); strcpy(name[i],name[min]); strcpy(name[min],temp2); } for(i=0;i printf("n%5d%10s",num[i],name[i]); } void search(n,num,name) int n,num[]; char name[N][8]; {int top,bott,min,loca; loca=0; top=0; bott=N-1; if((n loca=-1; while((loca==0)&&(top<=bott)) {min=(bott+top)/2; if(n==num[min]) {loca=min; printf("number=%d,name=%sn",n,name[loca]); } else if(n bott=min-1; else top=min+1; } if(loca==0||loca==-1) printf("number=%d is not in tablen",n); } main() {int num[N],number,flag,c,n; char name[N][8]; input_e(num,name); sort(num,name); for(flag=1;flag;) {scanf("%d",&number); search(number,num,name); printf("continue?Y/N!"); c=getchar(); if(c=='N'||c=='n') flag=0; } } 8.16 #include #define MAX 1000 main() {int c,i,flag,flag1; char t[MAX]; i=0; flag=0; flag1=1; while((c=getchar())!='0'&&i {if(c>='0'&&c<='9'||c>='A'&&c<='F'||c>='a'&&c<='f') {flag=1; t[i++]=c; } else if(flag) {t[i]='0'; printf("nnumber=%dn",htoi(t)); printf("continue?"); c=getchar(); if(c=='n'||c=='N') flag1=0; else {flag=0; i=0; } } } } htoi(s) char s[]; {int i,n; n=0; for(i=0;s[i]!='0';i++) {if(s[i]>='0'&&s[i]<='9') n=n*16+s[i]-'0'; if(s[i]>='a'&&s[i]<='f') n=n*16+s[i]-'a'+10; if(s[i]>='A'&&s[i]<='F') n=n*16+s[i]-'A'+10; } return(n); } 8.17 #include void convert(n) int n; {int i; if((i=n/10)!=0) convert(i); putchar(n%10+'0'); } main() {int number; scanf("%d",&number); if(number<0) {putchar('-'); number=-number; } convert(number); } 8.18 main() {int year,month,day; int days; scanf("n%d,%d,%d",&year,&month,&day); days=sum_day(month,day); if(leap(year)&&(month>=3)) days+=1; printf("days=%dn",days); } static int day_tab[13]={0,31,28,31,30,31,30,31,31,30,31,30,31} int sum_day(month,day) int month,day; {int i; for(i=1;i day+=day_tab[i]; return(day); } int leap(year) int year; {int leap; leap=year%4==0&&year%100!=0||year%400==0; return(leap); } 第九章 编译预处理 9.1 #define SWAP(a,b) t=b;b=a;a=t main() {int a,b,t; scanf("%d,%d",&a,&b); SWAP(a,b); printf("a=%dtb=%dn",a,b); } 9.2 #define SURPLUS(a,b) ((a)%(b)) main() {int a,b; scanf("%d,%d",&a,&b); printf("%d",SURPLUS(a,b)); } 9.3 #include"math.h" #define S(a,b,c) ((a+b+c)/2) #define AREA(a,b,c) (sqrt(S(a,b,c)*(S(a,b,c)-a)*(S(a,b,c)-b)*(S(a,b,c)-c))) main() {float a,b,c; scanf("%f,%f,%f",&a,&b,&c); if(a+b>c&&b+c>a&&a+c>b) printf("area=%8.2fn",AREA(a,b,c)); else printf("input error"); } 9.4 #define LEAP(y) (y%4==0)&&(y%100!=0)||(y%400==0) main() {int year; scanf("%d",&year); if(LEAP(year)) printf("yes"); else printf("no"); } 8.5 printf("value=%formatt",x); printf("value=%formatt",x);putchar('n'); printf("value=%formatt",x1);printf("value=%formatt",x2);putchar('n'); 输出结果： value=5.000000ormat value=5.000000ormat value=3.000000ormat value=8.000000ormat 9.6 #define PR printf #define NL "n" #define Fs "%f" #define F "%6.2f" #define F1 F NL #define F2 F "t" F NL #define F3 F "t" F "t" F NL main() {float a,b,c; scanf(Fs,&a); scanf(Fs,&b); scanf(Fs,&c); PR(NL); PR(F1,a); PR(F1,b); PR(F1,c); PR(NL); PR(F2,a,b); PR(F1,c); PR(NL); PR(F3,a,b,c); } 9.7 /*format.h文件*/ #define DIGIT(d) printf("%dn",d) #define FLOAT(f) printf("%8.2fn",f) #define STRING(s) printf("%sn",s) /*用户文件*/ #include"format.h" main() {int d,num; float f; char s[80]; scanf("%d",&num); switch(num) {case 1:scanf("%d",&d); DIGIT(d); break; case 2:scanf("%f",&f); FLOAT(f); break; case 3:scanf("%s",s); STRING(s); break; default:printf("error"); } } 9.8 main() {int a,b,c; scanf("%d,%d,%d",&a,&b,&c); printf("max=%dn",max(a,b,c)); } max(a,b,c) int a,b,c; {int t; t=x>y?x:y; return(t>z?t:z); } #define MAX(a,b) ((a)>(b)?(a):(b)) main() {int a,b,c; scanf("%d,%d,%d",&a,&b,&c); printf("max=%dn",MAX(MAX(a,b),c)); } 9.10 #include"stdio.h" #define MAX 80 #define CHANGE 1 main() {char str[MAX]; int i; scanf("%s",str); #if(CHANGE) {for(i=0;i {if(str[i]!='0') if(str[i]>='a'&&str[i]<'z'||str[i]>='A'&&str[i]<'Z') str[i]++; else if(str[i]=='z'||str[i]=='Z') str[i]-=25; } } #endif printf("n%sn",str); } 第十章 指针 10.1 main() {int n1,n2,n3; int *p1,*p2,*p3; scanf("%d,%d,%d",&n1,&n2,&n3); p1=&n1; p2=&n2; p3=&n3; if(n1>n2)swap(p1,p2); if(n1>n3)swap(p1,p3); if(n2>n3)swap(p2,p3); printf("%d,%d,%dn",n1,n2,n3); } swap(p1,p2) int *p1,*p2; {int p; p=*p1;*p1=*p2;*p2=p; } 10.2 main() {char *str1[20],*str2[20],*str3[20]; char swap(); scanf("%s",str1); scanf("%s",str2); scanf("%s",str3); if(strcmp(str1,str2)>0)swap(str1,str2); if(strcmp(str1,str3)>0)swap(str1,str3); if(strcmp(str2,str3)>0)swap(str2,str3); printf("%sn%sn%sn",str1,str2,str3); } char swap(p1,p2) char *p1,*p2; {char *p[20]; strcpy(p,p1); strcpy(p1,p2); strcpy(p2,p); } 10.3 main() {int number[10]; input(number); max_min_value(number); output(number); } input(number) int number[10]; {int i; for(i=0;i<10;i++) scanf("%d",&number[i]); } max_min_value(number) int number[10]; {int *max,*min; int *p,*end; end=number+10; max=min=number; for(p=number+1;p if(*p>*max)max=p; else if(*p<*min)min=p; *p=number[0]; number[0]=*min; *min=*p; *p=number[9]; number[9]=*max; *max=*p; return; } output(number) int number[10]; {int *p; for(p=number;p printf("%d,",*p); printf("%dn",*p); } 10.4 main() {int number[20],n,m,i; scanf("%d",&n); scanf("%d",&m); for(i=0;i scanf("%d",&number[i]); move(number,n,m); for(i=0;i printf("%8d",number[i]); } move(array,n,m) int array[20],n,m; {int *p,end; end=*(array+n-1); for(p=array+n-1;p>array;p--) *p=*(p-1); *array=end; m--; if(m>0)move(array,n,m); } 10.5 #define nmax 50 main() {int i,k,m,n,num[nmax],*p; scanf("%d",&n); p=num; for(i=0;i *(p+i)=i+1; i=k=m=0; while(m {if(*(p+i)!=0)k++; if(k==3) {*(p+i)=0; k=0; m++; } i++; if(i==n)i=0; } while(*p==0)p++; printf("%d",*p); } 10.6 main() {int len; char *str[20]; scanf("%s",str); len=length(str); printf("nlen=%dn",len); } length(p) char *p; {int n=0; while(*p!='0') {n++;p++;} return(n); } 10.7 main() {int m; char *str1[20],*str2[20]; scanf("%s",str1); scanf("%d",&m); if(strlen(str1) printf("error"); else {copystr(str1,str2,m); printf("%s",str2); } } copystr(p1,p2,m) char *p1,*p2; int m; {int n=0; while(n {n++;p1++;} while(*p1!='0') {*p2=*p1; p1++; p2++; } *p2='0'; } 10.8 #include"stdio.h" main() {int cle=0,sle=0,di=0,wsp=0,ot=0,i; char *p,s[20]; for(i=0;i<20;i++)s[i]=0; i=0; while((s[i]=getchar())!='n')i++; p=s; while(*p!='n') {if(*p>='a'&&*p<='z') ++sle; else if(*p>='A'&&*p<='Z') ++cle; else if(*p==' ') ++wsp; else if(*p>='0'&&*p<='9') ++di; else ++ot; p++; } printf("sle=%d,cle=%d,wsp=%d,di=%d,ot=%dn",sle,cle,wsp,di,ot); } 10.9 main() {int a[3][3],*p,i; for(i=0;i<3;i++) scanf("%d,%d,%d",a[i][0],a[i][1],a[i][2]); p=a; move(p); for(i=0;i<3;i++) printf("%d %d %dn",a[i][0],a[i][1],a[i][2]); } move(pointer) int *pointer; {int i,j,t; for(i=0;i<2;i++) for(j=i+1;j<3;j++) {t=*(pointer+3*i+j); *(pointer+3*i+j)=*(pointer+3*j+i); *(pointer+3*j+i)=t; } } 10.10 main() {int a[5][5],*p,i,j; for(i=0;i<5;i++) for(j=0;j<5;j++) scanf("%d",&a[i][j]); p=a; change(p); for(i=0;i<5;i++) {printf("n"); for(j=0;j<5;j++) printf("%8d",a[i][j]); } } change(p) int *p; {int i,j,change; int *pmax,*pmin; pmax=p; pmin=p; for(i=0;i<5;i++) for(j=0;j<5;j++) {if(*pmax<*(p+5*i+j))pmax=p+5*i+j; if(*pmin>*(p+5*i+j))pmin=p+5*i+j; } change=*(p+12); *(p+12)=*pmax; *pmax=change; change=*p; *p=*pmin; *pmin=change; pmin=p+1; for(i=0;i<5;i++) for(j=0;j<5;j++) if(((p+5*i+j)!=p)&&(*pmin>*(p+5*i+j)))pmin=p+5*i+j; change=*(p+4); *(p+4)=*pmin; *pmin=change; pmin=p+1; for(i=0;i<5;i++) for(j=0;j<5;j++) if(((p+5*i+j)!=(p+4))&&((p+5*i+j)!=p)&&(*pmin>*(p+5*i+j))) pmin=p+5*i+j; change=*(p+20); *(p+20)=*pmin; *pmin=change; pmin=p+1; for(i=0;i<5;i++) for(j=0;j<5;j++) if(((p+5*i+j)!=p)&&((p+5*i+j)!=(p+4))&&((p+5*i+j)!=(p+20)) &&(*pmin>*(p+5*i+j)))pmin=p+5*i+j; change=*(p+24); *(p+24)=*pmin; *pmin=change; } 10.11 main() {int i; char *p,str[10][10]; for(i=0;i<10;i++) scanf("%s",str[i]); p=str; sort(p); for(i=0;i<10;i++) printf("%sn",str[i]); } sort(p) char *p; {int i,j; char s[10],*smax,*smin; for(i=0;i<10;i++) {smax=p+10*i; for(j=i+1;j<10;j++) {smin=p+10*j; if(strcmp(smax,smin)>0) {strcpy(s,smin); strcpy(smin,smax); strcpy(smax,s); } } } } 10.12 #define MAX 20 main() {int i; char *pstr[10],str[10][MAX]; for(i=0;i<10;i++) pstr[i]=str[i]; for(i=0;i<10;i++) scanf("%s",pstr[i]); sort(pstr); for(i=0;i<10;i++) printf("%sn",pstr[i]); } sort(pstr) char *pstr[10]; {int i,j; char *p; for(i=0;i<10;i++) {for(j=i+1;j<10;j++) {if(strcmp(*(pstr+i),*(pstr+j))>0) {p=*(pstr+i); *(pstr+i)=*(pstr+j); *(pstr+j)=p; } } } } 10.13 #include"math.h" main() {int n=20; float a,b,a1,b1,a2,b2,c,(*p)(),jiff(); scanf("%f,%f",&a,&b); scanf("%f,%f",&a1,&b1); scanf("%f,%f",&a2,&b2); p=sin; c=jiff(a,b,n,p); printf("sin=%fn",c); p=cos; c=jiff(a1,b1,n,p); printf("cos=%fn",c); p=exp; c=jiff(a2,b2,n,p); printf("exp=%fn",c); } float jiff(a,b,n,p) float a,b,(*p)(); int n; {int i; float x,f,h,area; h=(b-a)/n; x=a; area=0; for(i=1;i<=n;i++) {x=x+h; area=area+(*p)(x)*h; } return(area); } 10.14 main() {int i,n,num[20]; char *p; scanf("%d",&n); for(i=0;i scanf("%d",&num[i]); p=num; sort(p,n); for(i=0;i printf("%8d",num[i]); } sort(p,m) char *p; int m; {int i; char change,*p1,*p2; for(i=0;i {p1=p+i; p2=p+(m-1-i); change=*p1; *p1=*p2; *p2=change; } } 10.15 main() {int i,j,*pnum,num[4]; float score[4][5],aver[4],*psco,*pave; char course[5][10],*pcou; pcou=course[0]; for(i=0;i<5;i++) scanf("%s",pcou+10*i); printf("number"); for(i=0;i<5;i++) printf(",%s",pcou+10*i); printf("n"); psco=score; pnum=num; for(i=0;i<4;i++) {scanf("%d",pnum+i); for(j=0;j<5;j++) scanf(",%f",psco+5*i+j); } pave=aver; printf("n"); avsco(psco,pave); avcour1(pcou,psco); printf("n"); fali2(pcou,pnum,psco,pave); printf("n"); good(pcou,pnum,psco,pave); } avsco(psco,pave) float *psco,*pave; {int i,j; float sum,average; for(i=0;i<4;i++) {sum=0; for(j=0;j<5;j+) sum+=(*(psco+5*i+j)); average=sum/5; *(pave+i)=average; } } avcour1(pcou,psco) char *pcou; float *psco; {int i; float sum,average1; sum=0; for(i=0;i<4;i++) sum+=(*(psco+5*i)) average1=sum/4; printf("%s %5.2fn",pcou,average1); } fali2(pcou,pnum,psco,pave) char *pcou; int *pnum; float *psco,*pave; {int i,j,k,label; printf("nnumbern"); for(i=0;i<5;i++) printf("%-8s",pcou+10*i); printf("naveragen"); for(i=0;i<4;i++) {label=0; for(j=0;j<5;j++) if(*(psco+5*i+j)<60.0)label++; if(label>=2) {printf("%-8d",*(pnum+i)); for(k=0;k<5;k++) printf("%-8.2f",*(psco+5*i+k)); printf("%-8.2f",*(pave+i)); } } } good(pcou,pnum,psco,pave) char *pcou; int *pnum; float *psco,*pave; {int i,j,k,label; printf("number"); for(i=0;i<5;i++) printf("%-8s",pcou+10*i); printf("average"); for(i=0;i<4;i++) {label=0; for(j=0;j<5;j++) if(*(psco+5*i+j)>=85.0)label++; if((label>=5)||(*(pave+i)>=90)) {printf("%-8d",*(pnum+i)); for(k=0;k<5;k++) printf("%-8.2f",*(psco+5*i+k)); printf("%-8.2f",*(pave+i)); } } } 10.16 #include"stdio.h" main() {char str[50],*pstr; int i,j,k,m,e10,digit,ndigit,a[10],*pa; gets(str); pstr=str; pa=a; ndigit=0; i=j=0; while(*(pstr+i)!='0') {if((*(pstr+i)>='0')&&(*(pstr+i)<='9')) j++; else {if(j>0) {digit=*(pstr+i-1)-48; k=1; while(k {e10=1; for(m=1;m<=k;m++) e10=e10*10; digit+=(*(pstr+i-1-k)-48)*e10; k++; } *pa=digit; ndigit++; pa++; j=0; } } i++; } if(j>0) {digit=*(pstr+i-1)-48; k=1; while(k {e10=1; for(m=1;m<=k;m++) e10=e10*10; digit+=(*(pstr+i-1-k)-48)*e10; k++; } *pa=digit; ndigit++; j=0; } printf("ndigit=%dn",ndigit); j=0; pa=a; for(j=0;j printf("%d",*(pa+j)); } 10.17 main() {int m; char str1[20],str2[20],*p1,*p2; scanf("%s",str1); scanf("%s",str2); p1=str1; p2=str2; m=strcmp(p1,p2); printf("%dn",m); } strcmp(p1,p2) char *p1,*p2; {int i=0; while(*(p1+i)==*(p2+i)) if(*(p+i++)=='0')return(0); return(*(p1+i)-*(p2+i)); } 10.18 main() {static char *mname[13]={"illeagl","January","February","March", "April","May","June","July","August","September","October", "November","December"}; int n; scanf("%d",&n);
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