train 2 (Bài 1)

#include <iostream>
#include <math.h>
using namespace std;
int main(){
    int a;
    int b;
    int c;
    int delta = (pow(b,2)- 4*a*c) ;
    cout<<"phuong trinh ax^2+bx+c=0 , nhap vao a,b,c de bat dau giai"<< endl;
    cout<<"a : "; cin>> a;
    cout<<"b : "; cin>> b;
    cout<<"c : "; cin>> c;
    if (a==0)
    {
        cout<<"pt co nghiem la : "<< -b/c ;
    }
    else
        {
            if (delta < 0)
            {
                cout<<"pt vo nghiem ! ";
            }
            else
                {
                    if (delta = 0)
                        {
                            cout<<"phuong trinh co nghiem kep la : "<<-b/(2*a);
                        }
                    else
                    {
                        cout<<"pt co 2 nghiem phan biet la "<< (-b - sqrt(delta))/(2*a)<< " va "<<(-b + sqrt(delta))/(2*a);
                    }
                }
        }


            return 0;
}