1955c语言实验，判断素数

#include<stdio.h>

int main(){
    int n;
    scanf("%d",n);
    if(n%2==1)
        printf("This is a prime");
    else
        printf("This is not a prime");
}

#include <stdio.h>
int main()
{
    int n,i;
    scanf("%d",&n);
    for (i=2;i<n;i++)
    {
        if(n%2 == 0)
            break;
    }
    if(i==n)
        printf("This is a prime");
    else
        printf("This is not a prime");
    return 0;
}