#include <iostream>
#include <fstream> 

using namespace std; 

void writesentence(ostream & of);
int  readinteger(istream & ifs); 

int main(void)
{
   ofstream outputfile; 
   ifstream inputfile; 

   outputfile.open("output.txt");
   inputfile.open("input.txt"); 
   writesentence(outputfile); 

   cout << "read in " << readinteger(inputfile) << endl; 

   outputfile.close(); 
   inputfile.close(); 

   return 0; 
}

void writesentence(ostream & of)
{
   of<< "Hellow World " << endl; 
}

int readinteger(istream & ifs)
{
   int myint; 
   ifs >> myint; 

   return myint; 
}