creating asm programs
jbwyatt.com

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.. Using Visual C++ to write C++ code

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    • In Class Demo: Sum every pair of numbers in a file 
    // ID: Joseph Wyatt, CIS 163, 10-04-02
// PURPOSE: Demonstrate files, loops, summing
/* DESIGN: 
 open file
 read 2 integers from file
 while not at end of file
    add the integers giving the sum
    output sum
    add the sum to the running total
    read 2 integers from file
 end while
 output the running total
*/ close file
//-------------------------------------------
#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>
using namespace std;
int main()
{
const string LINES = "+=========================+\n";
ifstream dataFile;   // input data - integers
int num1, num2, sum; // for sum equation
int total = 0;       // must init - accumulator

// open file & read first 2 integers
dataFile.open("data.dat");
dataFile >> num1 >> num2;

// print header (also used as footer)
cout << LINES << endl;

// while there's data, add nums, add to total, output, read 2 more nums
while (dataFile != 0)
{
  sum = num1 + num2;
  total = total + sum;
  cout << left << setw(12) << " The sum of "
       << right << setw(4) << num1 << " & "
       << setw(4) << num2 << " = " << setw(4)
       << sum << endl << endl;
  // read next data
  dataFile >> num1 >> num2;
}
// output grand total, close file and end program
cout << " The grand total is " << total << endl;
cout << endl << LINES << endl;
dataFile.close();
return 0;
}

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