What's wrong with the following program?
(Copy it and paste it to C++ program to see it)
Hint: Is there any interface between user and programmer?  Does the program take user's information?
         What is it for if the program only displays information?

#include<iostream>
#include<iomanip>
using namespace std;

void main ()
{
	int Hundred, Fifty, Twenty, Ten, Five, One;
	cout<< "Enter number of one dollar bills(-1 to quit): 769 ";
	cout<<endl<<endl;
	cout<< "769 dollar bills will be change to" <<endl;

	Hundred= 7;  
	Fifty= 1; 
	Twenty= 0; 
	Ten= 1; 
	Five= 1;  
	One= 4;  

	cout<<endl<<endl;
	cout<< setw(10)<< "Hundred"<< setw(10)<< "Fifty"<< setw(10)<< "Twenty"<< setw(10)<< "Ten"<< setw(10)<< "Five"<<setw(10)<< "One" <<endl;
	cout<< setw(10)<< Hundred<< setw(10)<< Fifty<< setw(10)<< Twenty<< setw(10)<< Ten<< setw(10)<< Five<< setw(10)<< One <<endl;
	
	cout<< "Enter number of one dollar bills(-1 to quit): 396";
	cout<<endl<<endl;
	cout<< "396 dollar bills will be change to" <<endl;

	Hundred= 3;  
	Fifty= 1; 
	Twenty= 2; 
	Ten= 0; 
	Five= 1;  
	One= 1;  

	cout<<endl<<endl;
	cout<< setw(10)<< "Hundred"<< setw(10)<< "Fifty"<< setw(10)<< "Twenty"<< setw(10)<< "Ten"<< setw(10)<< "Five"<<setw(10)<< "One" <<endl;
	cout<< setw(10)<< Hundred<< setw(10)<< Fifty<< setw(10)<< Twenty<< setw(10)<< Ten<< setw(10)<< Five<< setw(10)<< One <<endl;

	cout<< "Enter number of one dollar bills(-1 to quit): 542";
	cout<<endl<<endl;
	cout<< "542 dollar bills will be change to" <<endl;

	Hundred= 5;  
	Fifty= 0; 
	Twenty= 2; 
	Ten= 0; 
	Five= 0;  
	One= 2;  

	cout<<endl<<endl;
	cout<< setw(10)<< "Hundred"<< setw(10)<< "Fifty"<< setw(10)<< "Twenty"<< setw(10)<< "Ten"<< setw(10)<< "Five"<<setw(10)<< "One" <<endl;
	cout<< setw(10)<< Hundred<< setw(10)<< Fifty<< setw(10)<< Twenty<< setw(10)<< Ten<< setw(10)<< Five<< setw(10)<< One <<endl;
    
    cout<< "Enter number of one dollar bills(-1 to quit): -1 "<<endl<<endl;
}