程序代码：

#include <stdio.h>

int main (void)  {
    int a, b, i=0;
    b=1;
    foolish:
    ++i;
    printf("please input a number:");
    scanf("%d", &a);
    printf("\n Only %d chances \n", 4-i);
    if (i>4) {goto death;}
    if (99 != a) {goto foolish;}
    
    
       death:
       do {
         printf("\nworry number");
         b++;
         } while (a == b);
     
    return 0;
}