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main.cpp
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main.cpp
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// ====================
#include <iostream>
using namespace std;
// ====================
// ================
// Enumerated Types
// =======================================================
enum Operations {Addition, Subtraction, Multiplication,
Division, Quit};
// =================================
// ==========
// Structures
// ==========
struct Fraction {
int num;
int den;
}; // Structure Fraction
// ========================
// ===================
// Function Prototypes
// ===================
Fraction Add(Fraction, Fraction);
Fraction GetFraction();
void Menu();
void Print(Operations, Fraction, Fraction, Fraction);
void ProcessCommand(Operations&);
void QueryUser(Operations&);
// ====================
// ===============
// Function main()
// ===============
int main() {
Operations choice = Quit;
do {
Menu();
QueryUser(choice);
ProcessCommand(choice);
} while (choice != Quit);
return 0;
} // Function main()
// ====================
// ========================================
Fraction Add(Fraction fA, Fraction fB) {
int a, b, c, d;
Fraction fC;
a = fA.num; b = fA.den;
c = fB.num; d = fB.den;
fC.num = a * d + b * c;
fC.den = b * d;
return fC;
} // Function Add()
// ===================
// ========================
Fraction GetFraction() {
Fraction f;
cout << "Enter a numerator ==> ";
cin >> f.num;
cout << "Enter a denominator ==> ";
cin >> f.den;
return f;
} // Function GetFraction()
// ===========================
// ==============
void Menu() {
cout << endl;
cout << "=====================" << endl;
cout << "1) Add 2) Subtract" << endl;
cout << "3) Multiply 4) Divide" << endl;
cout << "5) Quit" << endl;
cout << "=======" << endl;
} // Function Menu()
// ====================
// ==========================
void Print (Operations op,
Fraction fA, Fraction fB, Fraction fC) {
if (op == Addition)
cout << fA.num << "/" << fA.den << " + "
<< fB.num << "/" << fB.den << " = "
<< fC.num << "/" << fC.den << endl;
} // Function Print()
// =====================
// ==========================
void ProcessCommand(Operations& choice) {
Fraction fA, fB, fC;
if (choice == Quit)
cout << "Terminating execution." << endl;
else {
fA = GetFraction();
fB = GetFraction();
switch (choice) {
case Addition: fC = Add(fA, fB); break;
// case Subtraction: fC = Add(fA, fB); break;
// case Multiplication: fC = Add(fA, fB); break;
// case Division: fC = Add(fA, fB); break;
default: cout << "Error condition detected." << endl;
} // switch
} // else
Print(choice, fA, fB, fC);
} // Function ProcessCommand()
// ==============================
// =================================
void QueryUser(Operations& op) {
int choice;
cout << endl;
cout << "Enter your choice ==> ";
cin >> choice;
switch (choice) {
case 1: op = Addition; break;
case 2: op = Subtraction; break;
case 3: op = Multiplication; break;
case 4: op = Division; break;
case 5: op = Quit; break;
default: cout << "Input Error condition";
} // switch
} // Function QueryUser()
// =========================