Program C++

#include <iostream>
#include <math.h>

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 pers. 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<<"diskrimina = "<<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;
}