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C语言程序设计的习题里的东西，就是文曲星里的那个猜数字游戏，觉得蛮有意思，就编了一下。

#include <stdio.h>
#include <time.h>
#include <stdlib.h>
void main()
{
 int a[4], b[4]; int i, j, k, n, right, match; long now;
 srand(time(&now));
 for(i=1; i<=4; i++)
  a[i]=rand()%10;
 while(a[2]==a[1])
  a[2]=rand()%10;
 while(a[3]==a[1] || a[3]==a[2])
  a[3]=rand()%10;
 while(a[4]==a[1] || a[4]==a[2] || a[4]==a[3])
  a[4]=rand()%10;
 printf("Guess a four-digit number that randomly given by the computer.\nYou have 8 times to guess it.\n");
 for(k=1; k<=8; k++){
  right=match=0;
  scanf("%d", &n);
  for(j=4; j>=1; j--){
   b[j]=n%10;
   n=(n-b[j])/10;
   if(a[j]==b[j]){
    right++;}
   for(i=1; i<=4; i++){
    if(a[i]==b[j] && i!=j){
     match++;}
   }
  }
  if(right==4){
   printf("Bingo! You got it!\n"); break;}
  else
   printf("%dA %dB\t Try again!\n",right, match);
 }
 if(right!=4){
  printf("\nWhat a pity. You nearly made it!\n The correct answer is %d%d%d%d\n", a[1], a[2], a[3], a[4]);}
}