How to make exit button???

[ehsan687]

I wrote an factorial calculator and I did an if statement in do loop .
It works but it won't close!!

here is the code:

  #include <iostream>
#include <cmath>
using namespace std; 
int main()

{
	int fact=1;
		int num;
		bool hhh = false;
		cout << "                        Factorial Calc                         type -1 to exit" << endl;
	 do{
	cout << "Please enter a positive number: " ;
	cin >> num;
	 if (num > 0)
	 {hhh = true;}
	 else
	 {cout << "";
	 hhh = false;}
	 if (num == -1)
	 { system("pause");}
	 }
	 while (!hhh);
	for (int i = 1; i <=num; i++)
				{fact = fact * i;}
		cout << "the factor is: " << fact << endl;
		 do{
	cout << "Please enter another positive number: " ;
	cin >> num;
	 if (num > 0)
	{ for (int i = 1; i <=num; i++)
				{fact = fact * i;}
	 cout << "the factor is: " << fact << endl;}
	 else
	 {cout << "";
	 hhh = false;}
	  if (num == -1)
	 { system("pause");}
	 }
	 while (num == -1);
}

[Thomas1965]

Your code is far to complicated

#include <iostream>
#include <stdlib.h>

using namespace std;

int main(void)
{
  int fact = 1, num;
  
  cout << "                        Factorial Calc                         type -1 to exit" << endl;
  cout << "Please enter a positive number: " ;
  cin >> num;
  while (num != -1)
  {
    for (int i = 1; i <=num; i++)
    {
      fact = fact * i;
    }
    cout << "the factor is: " << fact << "\n\n";
    cout << "Please enter another positive number: " ;
    cin >> num;
  }
  
  system("pause");
}

[ehsan687]

i did it like this:

#include <iostream>
#include <cmath>
using namespace std; 
int main()

{
	int fact=1;
		int num;
		bool hhh = false;
		cout << "                        Factorial Calc                         type -1 to exit" << endl;
	 do{
		 	cout << "Please enter a positive number: " ;
	cin >> num;
	if (num < 1)
	cout << endl <<"Don't enter an negative number!" << endl<<endl;
	 }
		 
	 while (num == 0 || num < -1);

	 if (num == -1){
	 hhh = true;
	 num = -1;}
	 else
	{for (int i = 1; i <=num; i++)
				{fact = fact * i;}
	 cout << "the factor is: " << fact << endl;
	 fact = 1;}
		 while (num !=-1){
	cout << "Please enter another positive number: " ;
	cin >> num;
	 if (num > 0)
	{ for (int i = 1; i <=num; i++)
				{fact = fact * i;}
	 cout << "the factor is: " << fact << endl;
	 fact = 1;}
	 else if ( num <= 0 && num !=-1)
	 {cout << endl <<"Don't enter an negative number!" << endl<<endl;
	 hhh = false;}
		 }
	 system("pause");


		 }