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  　　.:.:经典c程序100例==91--100:.:.

  　　　　经典c程序100例==91--100

  【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()%100;

  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 【创建和谐家园】aller.\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;

  }

  ==============================================================

  【程序95】