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#include <iostream>
#include <cmath>
#include <fstream>
using namespace std;
int add (ofstream &);
int subtract (ofstream &);
int multiply (ofstream &);
double divide (ofstream &);
int remainder (ofstream &);
double average (ofstream &);
int maximum (ofstream &);
int minimum (ofstream &);
int square (ofstream &);
//ifstream infile ("C:\\Users\\DavidC\\Desktop\\HW_5_INPUT.txt");
ifstream infile ("con");
//ofstream outfile ("C:\\Users\\DavidC\\Desktop\\HW_5_OUTPUT.txt");
ofstream outfile ("con");
int main ()
{
char choice;
bool not_done = true;
do {
cout << "Please select a function to perform." << endl << endl;
cout << "Enter\t\t\tFor" << endl;
cout << "+\t\t\tAddition\n\t\t\tSubtraction\n*\t\t\tMultiplication\n/\t\t\tDivision\n%\t\t\tRemainder\nA\t\t\tAverage of two numbers\nX\t\t\tMaximum of two numbers\nM\t\t\tMinimum of two numbers\nS\t\t\tSquare of a number\nQ\t\t\tQuit program";
infile >> choice;
switch (choice) {
case '+':
add (outfile);
break;
case '':
subtract (outfile);
break;
case '*':
multiply (outfile);
break;
case '/':
divide (outfile);
break;
case '%':
remainder (outfile);
break;
case 'A':
average (outfile);
break;
case 'X':
maximum (outfile);
break;
case 'M':
minimum (outfile);
break;
case 'S':
square (outfile);
break;
case 'Q':
not_done = false;
default:
outfile << "Error: Please enter a valid selection." << endl;
break;
}
}
while (not_done);
return 0;
}
int add (ofstream &out)
{
int x, y, sum;
out << "Please enter the addend: ";
infile >> x >> endl;
out << "Please enter the augend: ";
infile >> y >> endl;
sum = x + y;
return sum;
}
int subtract (ofstream &out)
{
int x, y, difference;
out << "Please enter the minuend: ";
infile >> x >> endl;
out << "Please enter the subtrahend: ";
infile >> y >> endl;
difference = x  y;
return difference;
}
int multiply (ofstream &out)
{
int x, y, product;
out << "Please enter the multiplier: ";
infile >> x >> endl;
out << "Please enter the multiplicand: ";
infile >> y >> endl;
product = x * y;
return product;
}
double divide (ofstream &out)
{
double x, y, quotient;
out << "Please enter the dividend: ";
infile >> x >> endl;
out << "Please enter the divisor: ";
infile >> y >> endl;
quotient = (double)(x / y);
return quotient;
}
int remainder (ofstream &out)
{
int x, y, remain;
out << "Please enter the dividend: ";
infile >> x >> endl;
out << "Please enter the divisor: ";
infile >> y >> endl;
remain = x % y;
return remain;
}
int average (ofstream &out)
{
int x, y, avg;
out << "Please enter the first number: ";
infile >> x >> endl;
out << "Please enter the second number: ";
infile >> y >> endl;
avg = (x + y)/2;
return avg;
}
int maximum (ofstream &out)
{
int x, y, max;
out << "Please enter the first number: ";
infile >> x >> endl;
out << "Please enter the second number: ";
infile >> y >> endl;
if (x > y)
max = x;
else
max = y;
return max;
}
int minimum (ofstream &out)
{
int x, y, min;
out << "Please enter the first number: ";
infile >> x >> endl;
out << "Please enter the second number: ";
infile >> y >> endl;
if (x < y)
min = x;
else
min = y;
return min;
}
int square (ofstream &out)
{
int x, squared;
out << " Please enter the number that you would like to square: ";
infile >> x >> endl;
squared = x * x;
return squared;
}
 