triunghi

#include <iostream>
#include<math.h>
using namespace std;

class Triunghi{
    private:
        float a,b,c;
    public:
        Triunghi(float a, float b, float c);
        static int esteValid(float a, float b, float c);
        float perimetru();
        float aria();
        int esteDreptunghic();

};
Triunghi:: Triunghi(float a, float b, float c){
    this->a=a;
    this->b=b;
    this->c=c;
    cout<<"C initializare cu param"<<endl;

 }
int Triunghi:: esteValid(float a, float b, float c){
    int valid=0;
    if(a+b>c && a+c>b && b+c>a)
        valid=1;
    return valid;
}
float Triunghi:: perimetru(){
    float p=a+b+c;
    return p;

}
float Triunghi::aria(){
    float p=perimetru()/2;
    float ar=sqrt(p*(p-a)*(p-b)*(p-c));
    return ar;
}
int Triunghi:: esteDreptunghic(){
    int dreptunghic=0;
    float x=a*a;
    float y=b*b;
    float z=c*c;

    if(x==y+z || y==x+z || z==x+y)
        dreptunghic=1;
    return dreptunghic;
}

int main(){
    float a=3,b=4,c=5;
    if(Triunghi::esteValid(a,b,c)){
       Triunghi t(a,b,c);
       cout<<"Perimetrul este: "<<t.perimetru()<<endl;
       cout<<"Aria este: "<<t.aria()<<endl;
       cout<<"Este dreptunghic  - "<<(t.esteDreptunghic()?" Da ":" Nu ")<<endl;
    }else{
        cout<<"Nu pot forma un triunghi"<<endl;
    }


  return 0;
}