code giai phuong trinh bac 2

// test1.cpp : Defines the entry point for the console application.
//
#include"stdafx.h"
#include<stdio.h>
#include<iostream>
#include <conio.h>
#include<math.h>
#include<windows.h>
using namespace std;
int a,b,c,delta,n;
int solan=2;
void giaiptbac2();
int main(int argc, char *argv[])
{
cout<<"giai phuong trinh bac 2\n:";
if(argc==2)
solan=atoi(argv[1]);
for(int i=0;i<solan;i++)
{
cout<<"phuong trinh"<<i+1;
do
{
cout<<"\nnhap so a:"; cin>>a;
} while (a==0);
cout<<"nhap so b:"; cin>>b;
cout<<"nhap so c:"; cin>>c;
giaiptbac2();
}
Sleep(3000);
}
void giaiptbac2()
{
delta=b*b-4*a*c;
if(delta<0)
cout<< "ptvn";
else
if(delta == 0)
{
cout << "pt co nghiem kep:" << -b/2*a;
}
else
cout<<"pt co nghiem x1 :"<< ((-b-sqrt(delta))/(2*a))<<"\npt co nghiemm x2:"<< ((-b+sqrt(delta))/(2*a));
_getch();
}


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