Check even odd

/* C programme to check if a integer is even or odd */
#include<stdio.h>
int main(void)
{
    int a;
    printf("enter a number to test whether it is positive or not\n");
    scanf("%d",&a);
    if(a==0)
    {
        printf("zero\n");
    }
    else if(a%2==0)
    {
        printf("even\n");
    }
    else
    {
        printf("odd\n");
    }
    return 0;
}