Question

C++ Pr ogramming (CSC-115) Functions (pass by Reference) Programming project Using FUNCTIONS, write a C++ program that calculates the Area of a cirele, a square and a rectangle. Your program must prompt the user to select which area is to be calculated. Document your program. Apply the do while loop to repeat the program Apply the while loop for input validation. Apply the switch statements or the if/ else if statement to prompt the user for the area's selection. Based on your selection each choice enables the user to calculate a different area. Late assignments will not be accepted. Your formatted output must include the input info as well as the results in a readable format. Finding the Area of a Circle How to find the area of a circle: The area of a circle can be found by multiplying pi (which is equal to 3.14) by the square of the radius · If a circle has a radius of 4, its area is 3.14.4.4-50.24 If you know the diameter, the radius is 1/2 as large. Calculating the Area of a Square How to find the area of a square: The area of a square can be found by multiplying the base times itself. This is similar to the area of a rectangle, but the base is the same length as the height. .If a square has a base of length 6 inches its area is 6*6-36 square inches Calculating the Area of a Rectangle How to find the area of a rectangle: The area of a rectangle can be found by multiplying the base times the height. If a rectangle has a base of length 6 inches and a height of 4 inches, its area is 6'4-24 square inches. .

Answer 1

Please find the code below:

#include<iostream> // used for cout and cin

using namespace std;

void calcAreaCircle(float&,float&); // prototype of all the 3 functions

void calcAreaSquare(float&,float&); // variables are passed as reference

void calcAreaRectangle(float&,float&,float&);

int main() // main()

{

float areaCircle,areaSquare,areaRectangle; // variables to store the area of circle, square and rectangle

float cRadius; // variable to store the radius of circle

float sBase; // variable to store the base of square

float rHeight,rWidth; // variable to store height and width of rectangle

int choice; // variable to store the user's choice

do // using a do while loop for user's option

{

cout<<endl<<"Please select:"; // provide the menu to the user

cout<<endl<<"1. Area of Circle";

cout<<endl<<"2. Area of Square";

cout<<endl<<"3. Area of rectangle";

cout<<endl<<"0. Quit";

cout<<endl<<"Please enter your choice:";

cin>>choice; // Ask user for choice, take user's choice in variable choice

switch(choice) // using switch case statements to evaluate choice

{

case 1: // if choice is 1, ask user to enter radius

cout<<endl<<"Enter the radius of the circle:";

cin>>cRadius;

while(cRadius<=0) // using a while loop to evaluate if the radius is negative

{ // keep asking user for input till user provides valid data

cout<<endl<<"Please enter a positive value for radius";

cout<<endl<<"Enter the radius of circle:";

cin>>cRadius;

}

calcAreaCircle(cRadius,areaCircle); // call calAreaCircle() and pass radius and area of circle as parameters

cout<<endl<<"The area of circle is: "<<areaCircle; // print the area of circle

break;

case 2:

cout<<endl<<"Enter the base of the square:"; // if choice is 2, ask user to enter the base of square

cin>>sBase;

while(sBase<=0) // if base is negative, keep asking user for base till user provides valid input

{

cout<<endl<<"Please enter a positive value for base";

cout<<endl<<"Enter the base of the square:";

cin>>sBase;

}

calcAreaSquare(sBase,areaSquare); // call calcAreaSquare and pass base and area of square as parameter

cout<<endl<<"The area of square is: "<<areaSquare; // print the area of square

break;

case 3:

cout<<endl<<"Enter the height of the rectangle:"; // if choice is 3, ask user for height and base of rectangle

cin>>rHeight;

cout<<endl<<"Enter the base of the rectangle:";

cin>>rWidth;

while(rHeight<=0) // if height is negative, keep asking user for height till user provides valid input

{

cout<<endl<<"Please enter a positive value for height";

cout<<endl<<"Enter the height of the rectangle:";

cin>>rHeight;

}

while(rWidth<=0) // if base is negative, keep asking user for base till user provides valid input

{

cout<<endl<<"Please enter a positive value for base";

cout<<endl<<"Enter the base of the rectangle:";

cin>>rWidth;

}

calcAreaRectangle(rHeight,rWidth,areaRectangle); // call calcAreaRectangle() and pass height width and area of rectangle

cout<<endl<<"The area of rectangle is: "<<areaRectangle;

break;

case 0: // if case is 0, print good bye

cout<<endl<<"Good Bye!";

break;

default: // if any other value is used as choice, print invalid choice

cout<<endl<<"Invalid choice";

}

}while(choice!=0); // continue looping till user enters 0

return 0;

}

void calcAreaCircle(float& cRadius,float& areaCircle) // definition of calcAreaCircle()

{ // it takes the references of cRadius and areaCircle variables as parameters

float pi=3.14; // declare and initialize pi to 3.14

areaCircle=pi*cRadius*cRadius; // calculate area as pi*radius*radius

}

void calcAreaSquare(float& sBase,float& areaSquare) // definition of calcAreaSquare()

{ // it takes references of sBase and areaSquare as parameters

areaSquare=sBase*sBase; // calculate area as base * base

}

void calcAreaRectangle(float& rHeight,float& rWidth,float& areaRectangle) // definition of calcAreaRectangle()

{ // it takes references of rHeight,rWidth and areaRectangle as parameters

areaRectangle=rHeight*rWidth; // calculate area as height * width

}

===========================================================================================

Output: