帮忙看一下要怎么改，谢啦
#include<stdio.h>
#include<math.h>
void main()
{
    int i,j,n=0;
    for (i=3;i<=100;i+=2)
    {
        for(j=2;j<=sqrt(i);j++)
        {
            if(i%j==0)
            break;
        }
        if(j>sqrt(i))
        {
            printf("%5d",i);
            n++;
            if(n%5==0)
            printf("\n");
        }
    }
    printf("\n");
}
这段在Cfree里报错了，说是
[Error]  error: `main' must return `int'
[Warning]  warning: no newline at end of file
要怎么改啊，求教大神，谢啦

貌似把void main（）的void去

[ 本帖最后由 ygha1413 于 2014-4-14 20:28 编辑 ]