湘潭大學c語言課后習題答案

1、5.2#includevoid main()int a,b,c,num,n;printf(請輸入一個三位數(shù)：n);scanf(%d,&num);c=num%10;b=(num/10)%10;a=num/100;if(a=b&a!=c)n=1;else if(a=c&a!=b)n=1;else if(b=c&a!=b)n=1;elsen=0;if(n)printf(%dn,num);5.3#include#includevoid main()int x;double y;scanf(%d,&x); /*輸入x*/switch(x/10)case 0:y=cos(x+3.0);break;case

2、 1:y=pow(cos(x+7.5),2);break;case 2:y=pow(cos(x+4.0),4);break;printf(%lfn,y);5.4#includevoid main()int num,i,leap;scanf(%d,&num);if(num%2!=0)printf(是奇數(shù)n);if(num1)for(i=2;i=num/2;i+)if(num%i=0)leap=0;break;else leap=1;if(leap) printf(是素數(shù)n);else printf(不是素數(shù)n);else printf(是偶數(shù)n);5.5#include void main()

3、int a,b,c,i,n; for(i=0;i10000;i+) for(n=1;n10000;n+) a=i;b=a+n;c=b+n; if(a*c=5*b&b+c=8*a) printf(%d,%d,%dn,a,b,c); break; 6.1#include#includevoid main()double m=1.0,p=0.0;int k=1,n=1;dom=1.0/n;n=n+2;if(k%2=0)m=(-1.0)*m;p=p+m;k+;while(fabs(m)=1e-6);p=p*4.0;printf(%lfn,p);6.2#includevoid main()int k,k

4、1=1,k2=1,k3;float p=0,m;for(k=1;k=20;k+)k3=k1+k2;m=(float)k3/k2;p=p+m;k1=k2;k2=k3;printf(%fn,p);6.3(1).#includevoid main()int i,j,k; for(i=0;i=4;i+) for(j=0;j=3-i;j+) printf( ); for(k=0;k=2*i;k+) printf(*); printf(n); for(i=0;i=3;i+) for(j=0;j=i;j+) printf( ); for(k=0;k=6-2*i;k+) printf(*); printf(n

5、); (2. )#includevoid main()int i,j,k;char c=65; for(i=0;i=4;i+) for(j=0;j=3-i;j+) printf( ); for(k=0;k=2*i;k+) printf(%c,c); printf(n);c=c+1; for(i=0;i=3;i+) for(j=0;j=i;j+) printf( ); for(k=0;k=6-2*i;k+) printf(%c,c); printf(n); c=c+1; 6.4#includevoid main()int a,b,i,n;for(a=1;a3000;a+) for(b=0,i=1

6、;i=a/2;i+) if(a%i=0) b=b+i; for(n=0,i=1;i=b/2;i+) if(b%i=0) n=n+i; if(n=a&ab)printf(%d和%dn,a,b);6.5#include#includevoid main()int num,a,b,c,p;for(num=100;num1000;num+)c=num%10;b=num/10%10;a=num/100;p=pow(a,3)+pow(b,3)+pow(c,3);if(num=p)printf(%dn,num);6.6#includevoid main()int m,i,n;for(i=2;i1000;i+

7、) m=0;for(n=1;n=i/2;n+) if(i%n=0)m=m+n;if(i=m) printf(完數(shù):%d=,i);for(n=1;n=i/2;n+) if(i%n=0)printf(%d ,n);6.7#include#includevoid main()int i,a,b;for(i=1000;i=9999;i+)a=i%100;b=i/100;if(i=pow(a+b),2)printf(%dn,i);6.8#includevoid main()int i,a,b,c;for(i=100;i1000;i+)a=i%10;b=i/10%10;c=i/100;if(a=b)&(b

8、!=c)|(a=c)&(b!=c)|(b=c)&(a!=b)printf(%dn,i);6.9#includevoid main()int i,n=1,m;for(i=1;i10;i+)n=(n+1)*2;printf(第一天摘了%d個桃子n,n);7.1#include void main() int long a;char h16; int i; scanf(%ld,&a); i=15;while(a) int x=a%16; if(x10) hi=x+0; elsehi=x-10+A;a=a/16;i-; printf(十六進制:); i+; while(i16) printf(%c,h

9、i); i+; printf(n); 7.2#includeint main()int num,a10,m; int i=0,j,flag=1; scanf(%d,&num); do m=num%10;ai=m;num=num/10; i+; while (num%10!=0); for (j=0,i-;i=j;i-,j+) if (aj=ai)continue;else flag=0; break; if (flag) printf(是回文n); else printf(不是回文n); return 0; 7.3#includevoid main()int i,j,max,row=0,col

10、umn=0;int a34=1,3,5,7,2,6,8,9,11,22,33,10;max=a00;for(i=0;i=2;i+)for(j=0;jmax)max=aij;row=i;column=j;printf(max=%d,row=%d,column=%dn,max,row,column);7.4#includevoid main()int f10=1,1;int i,pow=0;for(i=2;i=9;i+)fi=3*fi-1+2*fi-2;for(i=0;i=9;i+)pow=pow+fi;printf(第十項是:%d,前十項和為:%dn,f9,pow);7.5#include vo

11、id main() int i,j; int a88; for(i=0;i8;i+) ai0=1; aii=1; for(i=2;i8;i+) for(j=1;ji;j+) aij=ai-1j-1+ai-1j;for(i=0;i8;i+) printf(%*d,18-i*2,ai0); for(j=1;j=i;j+) printf(%4d,aij); printf(n); 7.6#include#includevoid main()int i,m;char a100,b100;gets(a);gets(b);if(strcmp(a,b)!=0)if(strlen(a)strlen(b)strc

12、at(a,b);puts(a);elsestrcat(b,a);puts(b);8.1#include void Fun(int a) char h16; int i; i=15;while(a) int x=a%16; if(x10) hi=x+0; elsehi=x-10+A;a=a/16;i-; printf(十六進制:); i+; while(i16) printf(%c,hi); i+; printf(n); void main()int n;while(scanf(%d,&n)Fun(n);printf(n);8.6/(1.字符串的復制)/#include void strcpy(

13、char *c, char *d) int i=0;while(*(d+i)!=0) *(c+i)=*(d+i); i+;*(c+i)=0;void main() char a100,b100; printf(輸入一個字符串：); gets(b); strcpy(a,b); printf(復制后的字符串：%sn,a);/(2.字符串的連接)/#includevoid strcat(char *c,char *d)while(*c!=0)c+;while(*d!=0)*c=*d; c+; d+;*c=0;void main()char a100,b100;printf(分別輸入字符串a(chǎn)和b：n)

14、;gets(a);gets(b);strcat(a,b);printf(連接后的字符串：n);puts(a);/(3.字符串小寫字母改為大寫字母)/#includevoid strupr(char a100)int i;for(i=0;i=97&ai=122)ai=ai-32;void main()char a100;printf(輸入字符串：n);gets(a);strupr(a);printf(轉化后的字符串：n);puts(a);/(4.字符串大寫字母改為小寫字母)/#includevoid strlwr(char a100)int i;for(i=0;i=65&ai=90)ai=ai+

15、32;void main()char a100;printf(輸入字符串：n);gets(a);strlwr(a);printf(轉化后的字符串：n);puts(a);/(5.比較兩字符串是否相等)/#includeint strcmp(char *c,char *d)while(*c=*d&*c!=0&*d!=0)c+;d+;if(*c=*d)return 0;else if(*c*d)return 1;elsereturn -1;void main()char a100,b100;printf(分別輸入兩個字符串a(chǎn)和b：n);gets(a);gets(b);if(strcmp(a,b)=0

16、)printf(相等n);else if(strcmp(a,b)=1)printf(不等，且abn);elseprintf(不等，且ban);8.7#include#includefloat A(float a,float b,float c)float s;s=(a+b+c)/2.0;return(s);float B(float a,float b,float c)float area,s;s=A(a,b,c);area=sqrt(s*(s-a)*(s-b)*(s-c);return(area);void main()float a,b,c,area,s,p;printf(輸入三邊長a,b

17、,c:n);scanf(%f%f%f,&a,&b,&c);if(a+bc|a+cb|b+ca)printf(不能構成三角形n);elsep=B(a,b,c);printf(三角形面積是：%fn,p);8.10#include#includeint fun(int x)int i,m=1;for(i=1;i=x;i+)m=m*i;return(m);void main()int n=10,sum=0;for(n=1;n=10;n+)sum=sum+fun(n);printf(和為：%dn,sum);8.11#include#includevoid fun(char a)char i,m,n;n=i=strlen(a);while(i3)i=i-3;for(m=n;mi;m-)am=am-1;ai=,;n+;void main()static char a20;pri