确实调试起来小毛病不断，不可以a == b == c

#include <cstdio>
#include <cmath>
#include <iostream>
using namespace std;

int main() 
{
    double a, b, c;
    cin >> a >> b >> c;
    if(a < b) swap(a, b);
    if(a < c) swap(a, c);
    if(b < c) swap(b, c);
    //printf("值为%.1f %.1f %.1f", a, b, c);
    if(a >= (b + c)) printf("NAO FORMA TRIANGULO\n");
    else
    {
        if(a * a == b * b + c * c) printf("TRIANGULO RETANGULO\n");
        if(a * a > b * b + c * c) printf("TRIANGULO OBTUSANGULO\n");
        if(a * a < b * b + c * c) printf("TRIANGULO ACUTANGULO\n");
        if((a == b) && (b == c)) printf("TRIANGULO EQUILATERO\n");
        if((a == b) && (a != c) || (a == c) && (a != b) || (b == c) && (a != b)) printf("TRIANGULO ISOSCELES\n");
    }
    return 0;
}