Help with loop

#include <iostream.h>
#include "G:\Adv Prog\C++ files\lvp\String.h"

void main()
{
	int again=0;
	do
	{
		int num=0;
		cout<<"Enter num: ";
		cin>>num;
		if(num==1)
		{
			cout<<"one";
			again=0;
		}
		else if(num==2)
		{
			cout<<"two";
			again=0;
		}
		else
		{
			num=0;
			again=1;
		}
	}while(again==1);
	cout<<"\nDONE\n";
}

if (!cin) //test for failure state
{
     cin.clear(); //clear failure state
     char c = '\0';
     cin >> c; //get the character that was input
     if (c == 'g') num = -1;
}
//then add another if statement after the input
if (num == -1)
{
    cout << "gee";
    again = 0;
}

int main()
{
int again =0;
int num=0;
    do{
    
      cout<<"Enter number: ";
      cin>>num;
       switch(num)
       {
          case 1 : 
            cout<<"one<<endl;
            again  = 0;
            break;
          case 2: 
            cout<<"two"<<endl;
           again = 0;
            break;
          default:
           num=0
          again = 1;
           
      }

}while(again ==1);
cout<<"done"<<endl;
return 0;
}