经典C语言编程100例——题目+答案代码（完结）

【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。
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 smart! \1\1\n\n");
else if(var<25)
printf("\1\1 you are ordinary! \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;
}