【程序87】  
题目:回答结果(结构体变量传递)  
1.程序分析:  
2.程序源代码:  
#include "stdio.h"  
struct student  
{ int x;  
char c;  
} a;  
main()  
{a.x=3;  
a.c='a';  
f(a);  
printf("%d,%c",a.x,a.c);  
}  
f(struct student b)  
{  
b.x=20;  
b.c='y';  
}  
==============================================================  
【程序88嵌入式信盈达企鹅要妖气呜呜吧久零纪要】  
题目:读取7个数(1—50)的整数值,每读取一个值,程序打印出该值个数的*。  
1.程序分析:  
2.程序源代码:  
main()  
{int i,a,n=1;  
while(n<=7)  
{ do {  
scanf("%d",&a);  
}while(a<1||a>50);  
for(i=1;i<=a;i++)  
printf("*");  
printf("\n");  
n++;}  
getch();  
}  
==============================================================  
【程序89】  
题目:某个公司采用公用电话传递数据,数据是四位的整数,在传递过程中是加密的,加密规则如下:  
每位数字都加上5,然后用和除以10的余数代替该数字,再将第一位和第四位交换,第二位和第三位交换。  
1.程序分析:  
2.程序源代码:  
main()  
{int a,i,aa[4],t;  
scanf("%d",&a);  
aa[0]=a ;  
aa[1]=a 0/10;  
aa[2]=a 00/100;  
aa[3]=a/1000;  
for(i=0;i<=3;i++)  
{aa[i]+=5;  
aa[i]%=10;  
}  
for(i=0;i<=3/2;i++)  
{t=aa[i];  
aa[i]=aa[3-i];  
aa[3-i]=t;  
}  
for(i=3;i>=0;i--)  
printf("%d",aa[i]);  
}  
==============================================================  
【程序90】  
题目:专升本一题,读结果。  
1.程序分析:  
2.程序源代码:  
#include "stdio.h"  
#define M 5  
main()  
{int a[M]={1,2,3,4,5};  
int i,j,t;  
i=0;j=M-1;  
while(i {t=*(a+i);  
*(a+i)=*(a+j);  
*(a+j)=t;  
i++;j--;  
}  
for(i=0;i printf("%d",*(a+i));  
}  
【程序91】  
题目:时间函数举例1  
1.程序分析:  
2.程序源代码:  
#include "stdio.h"  
#include "time.h"  
void main()  
{ time_t lt; /*define a longint time varible*/  
lt=time(NULL);/*system time and date*/  
printf(ctime(<)); /*english format output*/  
printf(asctime(localtime(<)));/*tranfer to tm*/  
printf(asctime(gmtime(<))); /*tranfer to Greenwich time*/  
}  
==============================================================  
【程序92】  
题目:时间函数举例2  
1.程序分析:  
2.程序源代码:  
/*calculate time*/  
#include "time.h"  
#include "stdio.h"  
main()  
{ time_t start,end;  
int i;  
start=time(NULL);  
for(i=0;i<3000;i++)  
{ printf("\1\1\1\1\1\1\1\1\1\1\n");}  
end=time(NULL);  
printf("\1: The different is %6.3f\n",difftime(end,start));  
}  
==============================================================  
【程序93】  
题目:时间函数举例3  
1.程序分析:  
2.程序源代码:  
/*calculate time*/  
#include "time.h"  
#include "stdio.h"  
main()  
{ clock_t start,end;  
int i;  
double var;  
start=clock();  
for(i=0;i<10000;i++)  
{ printf("\1\1\1\1\1\1\1\1\1\1\n");}  
end=clock();  
printf("\1: The different is %6.3f\n",(double)(end-start));  
}  
==============================================================  
【程序94】  
题目:时间函数举例4,一个猜数游戏,判断一个人反应快慢。(版主初学时编的)  
1.程序分析:  
2.程序源代码:  
#include "time.h"  
#include "stdlib.h"  
#include "stdio.h"  
main()  
{char c;  
clock_t start,end;  
time_t a,b;  
double var;  
int i,guess;  
srand(time(NULL));  
printf("do you want to play it.('y' or 'n') \n");  
loop:  
while((c=getchar())=='y')  
{  
i=rand() 0;  
printf("\nplease input number you guess:\n");  
start=clock();  
a=time(NULL);  
scanf("%d",&guess);  
while(guess!=i)  
{if(guess>i)  
{printf("please input a little smaller.\n");  
scanf("%d",&guess);}  
else  
{printf("please input a little bigger.\n");  
scanf("%d",&guess);}  
}  
end=clock();  
b=time(NULL);  
printf("\1: It took you %6.3f seconds\n",var=(double)(end-start)/18.2);  
printf("\1: it took you %6.3f seconds\n\n",difftime(b,a));  
if(var<15)  
printf("\1\1 You are very clever! \1\1\n\n");  
else if(var<25)  
printf("\1\1 you are normal! \1\1\n\n");  
else  
printf("\1\1 you are stupid! \1\1\n\n");  
printf("\1\1 Congradulations \1\1\n\n");  
printf("The number you guess is %d",i);  
}  
printf("\ndo you want to try it again?(\"yy\".or.\"n\")\n");  
if((c=getch())=='y')  
goto loop;  
} |   
     
  
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