Find prime number or not in C

• https://monitechvenkat1620.blogspot.com

• Program :

#include <stdio.h>
int main()
{
    int n, i, flag = 0;
    printf("\n----------------PRIME OR NOT----------------"); 
    printf("\nEnter a positive integer: ");
    scanf("%d", &n);

    for (i = 2; i <= n / 2; ++i) {

        if (n % i == 0) {
            flag = 1;
            break;
        }
    }

    if (n == 1) {
        printf("\n1 is neither prime nor composite.");
    }
    else {
        if (flag == 0)
            printf("\n%d is a prime number.", n);
        else
            printf("\n%d is not a prime number.", n);
    }

    return 0;
}

• Output :