Kasus 3.3 - Alpro

Dev c++ 3.3
 #include <iostream>
#include <math.h>
/* run this program using the console pauser or add your own getch, system("pause") or input loop */
using namespace std;
int main(int argc, char** argv) {
    int a,b,c;
    long disk;
    float x1,x2;
    cout<<"Koefisien pangkat 2 : ";
    cin>>a;
    cout<<"Koefisien pangkat 1 : ";
    cin>>b;
    cout<<"Koefisien pangkat 0 : ";
    cin>>c;
    if(a==0){
        cout<<"Bukan persamaan kuadrat \n";
        cout<<"Harga akar = "<<-c/b;
    }
    else {
        disk= b*b-4*a*c;
    if(disk>0){
        x1=-b+sqrt(disk)/(2*a);
        x2=-b-sqrt(disk)/(2*a);
        cout<<"diskriminan = "<<disk<<endl;
        cout<<"x1 = "<<x1<<endl;
        cout<<"x2 = "<<x2<<endl;
    }
    else if(disk==0){
        x1=-b/(2*a);
        x2=x1;
        cout<<"diskriminan = 0 \n";
        cout<<"x1 = "<<x1<<endl;
        cout<<"x2 = "<<x2<<endl;
    }
    else
    cout<<"Akar imajiner";
    }

    return 0;
}