// Program Scope demonstrate scope rules and lifetime classes.
#include <iostream>
#include <fstream>
using namespace std;

int  counter;
int  sum = 0;
int  number;

ifstream  inNums;

void  SumNumbers(ifstream&, int&);

int main ()
{
    inNums.open("numeric.dat");
    {
       int  sum = 0;
       SumNumbers(inNums, sum);
       cout  << "Output from first call to SumNumbers"
	      << endl;
       cout  << "Sum is "  << sum  << endl;
    }
    SumNumbers(inNums, sum);
    cout  << "Output from second call to SumNumbers"
	   << endl;
    cout  << "Sum is "  << sum  << endl;
    return 0;
}
//**************************************

void  SumNumbers(ifstream& inFile, int& answer)
{
    static int  counter = 1;
    while (counter <= 4)
    {
	inFile  >> number;
	answer = answer + number;
	counter++;
    }
}