Algo Final P01

#include<stdio.h>
int main()
{
    int i, arr[5];
    int sum=0, flag=0;
    printf("Your ID: ");
    for(i=0; i<5; i++)
    {
        scanf("%d",&arr[i]);
    }
    for(i=0; i<5; i++)
    {
        sum+=arr[i];
    }
    printf("The sum is %d\n",sum);
    if(sum%2==0)
        printf("The sum is even.\n");
    else
        printf("The sum is odd.\n");
    for(i=2;i<=sum/2;++i)
    {
        if(sum%i==0)
        {
            flag = 1;
            break;
        }
    }

        if (flag == 0)
            printf("%d is a prime number.\n", sum);
        else
            printf("%d is not a prime number.\n", sum);




    return 0;
}