我写了一个程序，就是没有输出结果。我想向各位大神请教一下。问题出在哪儿？
# include "stdio.h"
 int main ()
 {
     int a,b,i,j,t;
     printf("请输入两个整数\n");
     scanf("%d,%d\n",&a,&b);
     if(a>b)
     {t=a;a=b;b=t;}
     i=2;
     j=0;
     a=a+1;
     while(a<=b)
     {while(a>=i)
        {if((a%i)==0&&a!=i)
            break;
        if(a==i)
        { printf("%d\t",a);
        j=j+1;}
               i=i+1;
     }
        
        if(j%5==0)
            printf("\n");a=a+1;i=2;
     }
     return 0;
 }