Question

code in C++

Create a program that uses the pass by reference operator instead of the return command.

Your main program will need to: create empty variables

call void function 1 with no input to display your name to the screen

call function 2 to collect the square feet that a gallon of paint covers from user

call function 2 to collect the square feet of wall that needs to be painted

call function 3 to calculate the number of gallons of paint ( round up )

display all of the user input values and all the calculated values with messages inside main after you have completed calling the functions.

Notes:

functions 2, and 3 will use reference variables for the answer, see description below. These functions will both take in two or more variables/arguments/parameters to perform the required calculations.

You should not repeat any calculations.
You should not use by reference operator unless you intend to change the value of that variable.

NO CALCULATIONS may occur in the main function. NO return statements are allowed for any of the functions. Functions may contain constants if reasonable.
All three functions will be void functions
NO global variables and no pointers are allowed.

Grading will be as follows

(5) function 1 - no input, no reference variables, no returned variables

(5) function 2 - takes in a string ( which will be the prompt message ), uses reference variable to get the value entered back to the main program. This function will display the prompt message and ask the user to enter a value, but will not use a return statement. Your program will call this function 2 times from main, sending different prompt messages. The two items you need to collect from the user are: the number of square feet a gallon of paint will cover and the square feet of wall to be painted.

(5) function 3 – takes in two numbers ( the square feet of wall to be painted, and the square feet a gallon of paint will cover) and calculates the number of gallons. Remember to use a round up function ( meaning .5 and higher needs another gallon ) Number of gallons is wall area divided by the square feet a gallon of paint will cover and should be calculated as an integer.

additional points will be awarded based on these considerations when grading include

You should need about three variables in main. Other variables may be created in the other functions but only 3 are probably all that is required.

You should not repeat any calculations.
Prompt for each variable only one time using function 2
Reasonable function names are expected ( NOT function1, function2 , etc )
You should not use by reference operator unless you intend to change the value of that variable.Program must contain a system(“pause”) statement.

code a second call statement for a bonus of 5 points will be given for using a single call to function 3 nesting the calls to function 2 .

Answer 1

All the explanations is in the code comments. Hope this helps!

Code:

#include <iostream>
#include <cmath>

using namespace std;

// function 1 to print name
void printName()
{
cout << "Chegg" << endl;
}

// function 2 to take user input
// use pointer for pass by reference
void takeInput(string prompt, double* input)
{
cout << prompt << endl;
cin >> *input;
}

// function 3 to calculate number of gallons required
void calculate(double *sqft, double *area, int *gallons)
{
// nesting of function 2 in function 3
takeInput("Enter the number of square feet a gallon of paint will cover", sqft);
takeInput("Enter the square feet of wall to be painted", area);
  
// calculate gallons
//take temperary to store gallons in floating point
double tmp = *area / *sqft;
*gallons = round(tmp);
}

int main()
{
// 3 variables
double sqft, area;
int gallons;
  
// call function 1 and 3
printName();
calculate(&sqft, &area, &gallons);
  
// print results
cout << "A gallon of paint will cover " << sqft << " square feet\n";
cout << "Area of wall to be painted is " << area << " square feet\n";
cout << "Gallons of paint required: " << gallons << endl;
  
return 0;
}

Sample output:

Code screenshots: