Again, modify the while loop to utilize tolower() or toupper(). Create two more functions (options #3 and #4 in your menu) by taking the to_kilograms() and to_pounds() functions and modifying them to use reference variables instead of normal pass by value variables. Name them: to_kilograms_ref() to_pounds_ref() Create another two functions (options #5 and #6 in your menu) by taking the to_kilograms() and to_pounds() functions and modifying them to use pointers instead of normal pass by value variables. Name them: to_kilograms_ptr() to_pounds_ptr() Your new Menu should look like this, which includes what type of variables are being used:

- Create two more functions (options #3 and #4 in your menu) by taking the to_kilograms() and to_pounds() functions and modifying them to use reference variables instead of normal pass by value variables. Name them:

- - to_kilograms_ref()
  - to_pounds_ref()
- Create another two functions (options #5 and #6 in your menu) by taking the to_kilograms() and to_pounds() functions and modifying them to use pointers instead of normal pass by value variables. Name them:

- - to_kilograms_ptr()
  - to_pounds_ptr()
- Your new Menu should look like this, which includes what type of variables are being used:

MENU

1. Kilograms to Pounds (pass by value)

2. Pounds to Kilograms (pass by value)

3. Kilograms to Pounds (pass by reference)

4. Pounds to Kilograms (pass by reference)

5. Kilograms to Pounds (using pointers)

6. Pounds to Kilograms (using pointers)

Example:

#include <iostream>

#include <cmath>

using namespace std;

// declare functions

void display_menu();

void convert_temp();

double to_celsius(double fahrenheit);

double to_fahrenheit(double celsius);

int main() {

cout << "Convert Temperatures\n\n";

display_menu();

char again = 'y';

while (again == 'y')

{

convert_temp();

cout << "Convert another temperature? (y/n): ";

cin >> again;

cout << endl;

}

cout << "Bye!\n";

}

// define functions

void display_menu()

{

cout << "MENU\n"

<< "1. Fahrenheit to Celsius\n"

<< "2. Celsius to Fahrenheit\n\n";

}

void convert_temp()

{

int option;

cout << "Enter a menu option: ";

cin >> option;

double f = 0.0;

double c = 0.0;

switch (option)

{

case 1:

cout << "Enter degrees Fahrenheit: ";

cin >> f;

c = to_celsius(f);

c = round(c * 10) / 10; // round to one decimal place

cout << "Degrees Celsius: " << c << endl;

break;

case 2:

cout << "Enter degrees Celsius: ";

cin >> c;

f = to_fahrenheit(c);

f = round(f * 10) / 10; // round to one decimal place

cout << "Degrees Fahrenheit: " << f << endl;

break;

default:

cout << "You must enter a valid menu number.\n";

break;

}

double to_celsius(double fahrenheit)

{

double celsius = (fahrenheit - 32.0) * 5.0 / 9.0;

return celsius;

}

double to_fahrenheit(double celsius)

{

double fahrenheit = celsius * 9.0 / 5.0 + 32.0;

return fahrenheit;

}

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