problem #3:triangle

#include <stdio.h>

int main()
{
    int a,b,c,sum;

    printf("Enter the angles of triangle:");
    scanf("%d %d %d",&a,&b,&c);

    sum=a+b+c;

    if(sum == 180 && a != 0 && b!= 0 && c != 0)
    {
        printf("Triangle is valid.");
    }
    else
    {
        printf("Triangle is not valid.");
    }

    return 0;
}