写函数判断素数

#define  _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<math.h>

int judge(int n)
{
    int j = 0;
    for (j = 2; j <=sqrt(n); j++)
    {
        if (n%j == 0)
            return 0;
    }
    return 1;
}

int main()
{
    int count = 0;
    int i = 0;
    for (i = 100; i <= 200; i++)
    {

        if (judge(i) == 1)
        {
            printf("%d  ", i);
            count++;
        }
    }
    printf("一共有%d个素数\n", count);
    return 0;
}