#include <iostream>
#include <string>
 
using namespace std;
 
void binary(int number) {
     int remainder;
     if(number <= 1)
     cout << number;
     remainder = number % 2;
     binary(number >> 1);
     cout << remainder;
}
 
int main(){
 
    int number;
    int choice;
 
    cout << "1. Binary to Decimal\n";
    cout << "2. Decimal to Binary\n";
    cout << "3. Quit Program\n";
    cout << "Enter your Choice: ";
    cin >> choice;
 
    switch (choice) {
 
           case '1':
                cout << "Please enter an integer: ";
                cin >> number;
                if (number < 0)
                        cout << "Error enter positive integer: ";
                else {
                     cout << "The number in Binary is: ";
                     binary(number);
                     cout << endl;
                }
 
 
}
system("pause");
return 0;
}

void binary(int num)
{
  if(num!=1) 
  {
    int rem=num%2;
    binary(num/2);
    cout<<rem;
  } 
  else
  cout<<num;
}