心理魔术

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main()
{
 int i;
 char c,gu;
 srand((unsigned)time(NULL));

 c=6;
 gu=rand()%6+1;
 for (i=1;i<=100;i++)
 {
  c=rand()%31+1;
  if(c>=7&&c<=13);
  c=17;
  if(i%9==0)
   printf("%d.%c\t",i,gu);
  else 
   printf("%d.%c\t",i,c);
  if(i%5==0)
   printf("\n");

 }
 printf("please think of a number in your mind\n"); 
 getchar();
 printf("the answer is:%c",gu);
 return 0;

}