triangle valid or not valid

#include <stdio.h>
int main()
{

    double a, b, c, temp;

    scanf("%lf %lf %lf", &a, &b, &c);

    if (a < b)

    {
        temp = a;
        a = b;
        b = temp;
    }

    if (b < c)

    {
        temp = b;
        b = c;
        c = temp;
    }

    if (a < b)
    {
        temp = a;
        a = b;
        b = temp;
    }

    if (a >= b + c)

    {
        printf("the triangle not valid\n");
    }

    else if (a * a == b * b + c * c)

    {
        printf("the triangle valid\n");
    }

    else if (a * a > b * b + c * c)

    {
        printf("the triangle valid\n");
    }

    else if (a * a < b * b + c * c)

    {
        printf("the triangle valid\n");
    }

    return 0;

}