3.Triangle proof

#include <stdio.h>

int main()
{
    int X,Y,Z,sum;

    printf("Enter the angles of triangle:");
    scanf("%d %d %d",&X,&Y,&Z);

    sum=X+Y+Z;

    if(sum == 180 && X != 0 && Y!= 0 && Z != 0)
    {
        printf("Triangle is valid.");
    }
    else
    {
        printf("Triangle is not valid.");
    }

    return 0;
}