Create A Program to Create a Simple Calculator in C++ Assignment Solution.

/******************************************************************************

 PROGRAM NAME: aSimpleCalculator.cpp

 DATE: 6 May 2019

 VERSION: 1.0

 AUTHOR: FH BERMUDEZ

 DESCRIPTION: This program demonstrates implementation of a simple

 (+, -, *, and /) calculator using modular design and proper documentation.

**/

#include<iostream>

#include<string>

using namespace std;

// Function Prototypes

void runApplication();

void displayMenu();

void getUserChoice();

void executeOperation();

void MERCURY();

void VENUS();

void pressEnterToContinue();

void clearConsole();

string planet;

// Global Constants

char const EXIT = '0';

int const MAX_STRING_LENGTH = 100;

// Global Variables

char userChoice = EXIT;

int main(int argc, char** argv)

{

  runApplication();

} // End of main

/******************************************************************************

 FUNCTION NAME: runApplication

 PARAMETER(S): none

 RETURN TYPE: void

 VERSION: 1.0

 DATE: 6 May 2019

 AUTHOR: FH BERMUDEZ

 DESCRIPTION: This method is the heart of the application, it calls the

 methods required to run the application.

**/

void runApplication()

{

  do {

      clearConsole();

      displayMenu();

      getUserChoice();

      executeOperation();

  } while (userChoice != EXIT);

} // End of runApplication

/******************************************************************************

 FUNCTION NAME: displayMenu

 PARAMETER(S): none

 RETURN TYPE: void

 VERSION: 1.0

 DATE: 6 May 2019

 AUTHOR: FH BERMUDEZ

 DESCRIPTION: This method display a simple menu and ask the user to enter

 the operation to perform, then calls the executeOperation method.

**/

void displayMenu()

{

  cout << " ____________________________________\n"

          "|This program calculates the weight |\n"

          "|of a person in one of the celestial |\n"

          "|bodies: mercury, venus, earth, mars,|\n"

          "|jupiter, saturn, uranus, neptune, |\n"

          "|pluto and moon. |\n"

          "|____________________________________|\n"

          "| MENU |\n"

          "| 0. Exit Program |\n"

          "| 1. Calculate the Weight |\n"

          "|____________________________________|\n"

          " Enter your choice: ";

} // End of displayMenu

/******************************************************************************

 FUNCTION NAME: getUserChoice

 PARAMETER(S): none

 RETURN TYPE: void

 VERSION: 1.0

 DATE: 6 May 2019

 AUTHOR: FH BERMUDEZ

 DESCRIPTION: This method gets the choice from the user as an "int" and

 stores the value in the global variable userChoice.

**/

void getUserChoice()

{

  cin >> userChoice; // Save the user input in the global variable

  cout << endl;

} // End of getUserChoice

/******************************************************************************

 FUNCTION NAME: executeOperation

 PARAMETER(S): none

 RETURN TYPE: void

 VERSION: 1.0

 DATE: 6 May 2019

 AUTHOR: FH BERMUDEZ

 DESCRIPTION: This method get the user choice and execute the selected

 operation

**/

void executeOperation()

{

  switch(userChoice)

  {

    case '0': cout << "Exiting Program" << endl;

              break;

    case '1': cout << "Enter the name of a planet: " << endl;

              cin >> planet;

         if (planet == "MERCURY")

        MERCURY();

         else if (planet == "VENUS")

        VENUS();

       else

        cout << "Invalid Planet, Please enter VENUS or MERCURY" << endl <<endl;

              break;

    default: cout << "Invalid Choice, Try Again" << endl <<endl;

             break;

  } // End of switch

  pressEnterToContinue();

  cout << endl << endl;

} // End of executeOperation

/******************************************************************************

 FUNCTION NAME: mercury

 PARAMETER(S): none

 RETURN TYPE: void

 VERSION: 1.0

 DATE: 6 May 2019

 AUTHOR: FH BERMUDEZ

 DESCRIPTION: This method ask the user to enter two numbers to add.

**/

void MERCURY()

{

  int number = 0;

  cout << "Enter your weight in pounds: ";

  cin >> number;

  cout << "Your weight of " << number << "lbs on mercury is: "

       << number * 0.4115;

  cout << endl << endl;

} // End of mercury

/******************************************************************************

 FUNCTION NAME: VENUS

 PARAMETER(S): none

 RETURN TYPE: void

 VERSION: 1.0

 DATE: 6 May 2019

 AUTHOR: FH BERMUDEZ

 DESCRIPTION: This method ask the user to enter two numbers to subtract.

**/

void VENUS()

{

  int number = 0;

  cout << "Enter your weight in pounds: ";

  cin >> number;

  cout << "Your weight of " << number << "lbs on venus is: "

       << number * 0.8975;

  cout << endl << endl;

} // End of venus

/******************************************************************************

 FUNCTION NAME: pressEnterToContinue

 PARAMETER(S): none

 RETURN TYPE: void

 VERSION: 1.0

 DATE: 6 May 2019

 AUTHOR: FH BERMUDEZ

 DESCRIPTION: This method implements the "Press Enter" to continue task,

 using cin and .ignore method.

**/

void pressEnterToContinue()

{

  char key;

  cin.clear(); //clears the error flag on cin

               //so that future I/O operations will work correctly.

  cin.ignore(MAX_STRING_LENGTH, '\n'); // ignore until <Enter> key

  cout << "Press [Enter] to continue . . .";

  key = cin.get();

} // End of pressEnterToContinue

/******************************************************************************

 FUNCTION NAME: clearConsole

 PARAMETER(S): none

 RETURN TYPE: void

 VERSION: 1.0

 DATE: 6 May 2019

 AUTHOR: FH BERMUDEZ

 DESCRIPTION: This method clears the screen console using the system()

 method call.

**/

void clearConsole()

{

  system("clear"); // use "cls" for windows, "clear" for linux

} // End of clearConsole