C程序设计习题答案.doc

C程序设计习题答案第八章第6题#includeint main()void js(char *q);char a100,*p;printf(请输入一个字符串：n);gets(a);p=a;js(p);return 0;void js(char *q)int i=0;while(*(q+i)!=0)i+;printf(该字符串一共有%d个字符n,i);第7题#includeint main()char a100,*p;printf(请输入一个字符串：n);gets(a);printf(请输入一个整数m：n);int m;scanf(%d,&m);p=a;printf(该字符串从第%d个字符开始复制成另一个字符串为：,m);printf(%s,p+m-1);printf(n);return 0;第9题#includeint main()int a33=1,2,3,4,5,6,7,8,9;int (*p)3;for(int i=0;i3;i+)for(int j=0;j3;j+)printf(%d ,aij);if(j=2) printf(n);p=a;for(i=0;i3;i+)for(int j=0;j3;j+)printf(%d ,*(*(p+j)+i);if(j=2) printf(n);return 0;第10题#include void main()int a15=1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,*p;printf(数组原来排列为：n);for(int i=0;i15;i+)printf(%3d,ai);if(i=4|i=9) printf(nn);printf(nn);int m=0,j=0,t=0;/把最大的整数放在中间for(p=a,i=0;pm) m=*p;j=i;t=a7;a7=m;aj=t;m=a14;/把最小的放在左上角for(p=a+14,i=14;p=a;p-,i-) if(*p=a;p-,i-)if(i!=0&*p=a;p-,i-)if(i!=0&i!=4&*pm) m=*p;j=i;t=a10;a10=m;aj=t;m=a1;/把第四小整数放在右下角for(p=a,i=0;pa+15;p+,i+)if(i!=0&i!=4&i!=10&*pm) m=*p;j=i;t=a14;a14=m;aj=t;printf(经过调整，把四个最小的整数从小到大分别排在四个角，把最大的排在中间后该数组变为：n);for(i=0;i15;i+)printf(%3d,ai);if(i=4|i=9) printf(nn);printf(n);第11题#include#include#includevoid main()void sort(char *x,char *y);char str1011;char *p10; for(int i=0;i10;i+)scanf(%s,stri); for(i=0;i10;i+)pi=stri; for(i=0;i=8;i+)for(int j=i+1;j0) sort(pi,pj); for(i=0;i10;i+)printf(%sn,pi);void sort(char *x,char *y) char *t=(char*)malloc(11*sizeof(char); strcpy(t,x); strcpy(x,y); strcpy(y,t); 12 题#include#include#includevoid main() void sort(char *x,char *y); char *p10; char str1020; for(int i=0;i10;i+)scanf(%s,stri); for(i=0;i10;i+) pi=stri; for(i=0;i=8;i+)for(int j=i+1;j0) sort(pi,pj);for(i=0;i10;i+)printf(%sn,pi);void sort(char *x,char *y)char *t=(char*)malloc(20*sizeof(char);strcpy(t,x); strcpy(x,y);strcpy(y,t); 14题#include void main() int a100,*p,n=0; p=a; do scanf(%d,p); p+; n+; while(getchar()!=n); p=a+n-1; do printf(%d ,*p); p-; while(p=a+0); printf(n);15题#include void main()void reserch1(float (*p)5,int n);void reserch2(float (*p)5,int n);void reserch3(float (*p)5,int n);float stdscore45=45,60,78,98,56,90,89,99,98,97,52,54,64,66,68,88,89,98,86,96;reserch1(stdscore,4);reserch2(stdscore,4);reserch3(stdscore,4);void reserch1(float (*p)5,int n)float sum=0.0,aver1=0.0;for(int i=0;i4;i+)sum=sum+*(*(p+i)+0);aver1=sum/n;printf(第一门功课平均成绩为：%5.2fn,aver1);void reserch2(float (*p)5,int n)for(int i=0;i4;i+)int flag=0;for(int j=0;j5;j+)if(*(*(p+i)+j)=2&j=4)float sum2=0.0,avre2=0.0;printf(第%d个学生有两门以上功课不及格，各科成绩为：,i+1);for(int j=0;j5;j+) printf(%5.2f;,*(*(p+i)+j);sum2=sum2+*(*(p+i)+j);printf(该学生平均成绩为：%5.2fn,sum2/5);void reserch3(float (*p)5,int n)float aver=0.0;for(int i=0;in;i+)for(int j=0;j85&j=4) printf(第%d个学生每门功课成绩都在85分以上。n,i+1);if(aver/5)90&j=4) printf(第%d个学生平均成绩95分以上。n,i+1);for(i=0;in;i+)for(int j=0;j90&j=4) printf(第%d个学生平均成绩90分以上。n,i+1);aver=0.0;16题#include string.h#include stdio.hvoid main()void zhzhshu(char *p);char s200;gets(s);zhzhshu(s);void zhzhshu(char *p)void shuchu(char *q);char *k;k=p;int m=0;char *a10=;while(*p!=0)if(*p=48&*p=57&(*(p-1)57) am=p;m+;p+;printf(字符串“%s”含有%d个整数n,k,m);printf(它们分别是：);for(int i=0;i=48&*q=57)printf(%c,*q);q+;printf(;);17题#include string.h#include stdio.hvoid main()int strcmp(char *p1,char *p2);char s1100,s2100;scanf(%s,s1);scanf(%s,s2);strcmp(s1,s2);int strcmp(char *p1,char *p2)int m=0;for(;(*p1!=0|*p2!=0);p1+,p2+)if(*p1=*p2) m=0;else if(*p1!=*p2) m=*p1-*p2;break;printf(%dn,m);return 0;18题#include#includevoid main()int n,i=0;char*mon=January,February,March,April,May,June,July,August,Semptember,October,November,December;while(i=0)printf(请输入数字：); scanf(%d,&n); printf(%d月的英文为：%s：n,n,monn-1