Question

Menu-driven programs will display the menu options to the user and then prompt them for a menu choice. This program will display the following menu in the following format:

Calculator Options:

1. Calculate the area of a circle
2. Calculate the area of a rectangle
3. Calculate the area of a triangle
4. Calculate the area of a trapezoid
5. Calculate the area of a sphere
6. Exit Enter your choice (1-6)

Once the user enters a choice for the menu, the program should use a switch statement to determine the user choice and calculate the area of the shape selected.

If the shape selected is a circle, the program must prompt the user for the radius of the circle. The area will be calculated and then displays the area indicating it is a circle.

For a menu choice for the rectangle, the program must prompt the user for the length and width of the rectangle. The program will then calculate the area of the rectangle and display the area indicating it is the area of a rectangle.

If the menu choice is a triangle, the program must prompt the user for the length of the triangle’s base and its height. The area is then calculated for the triangle and displays the area.

If the choice is a trapezoid, the program must prompt the user for the height and the two base lengths. The area is calculated and displayed indicating it is a trapezoid.

If a sphere is selected, the program must prompt the user for the radius. Calculate the area and then display the area of the sphere indicating it is a sphere.

Other requirements and formulas:

• Make PI a named constant
• Circle area = PI * r²
• Rectangle area = length * width
• Triangle area = base * height * 0.5
• Trapezoid area = height/2 * (b1 +b2)
• Sphere area = 4 * PI *r²

The program should validate the user menu choice. If an invalid menu option, it should display a message telling the user what the valid choices are and exit the program.

The program should also not allow the user to enter a negative number for any of the values used to calculate the areas. If they do the program must indicate which value entered was invalid, being specific. For example, for a rectangle, if the length is invalid there should be a message like “Value entered for the length is invalid”.

Pseudocode must be provided in the comment block at the top of the file.

C++ Language Only

Answer 1

#include <iostream>

using namespace std;

int main()

{

    int choice;

    char ans='y';

    float const pi=3.14;

    float radius,length,width,height,base,base1,base2,area;

    do          //loop to repeatedly display the menu till the user wants to exit

    {

        //To display the menu

        cout<<"Enter your shape 1. Circle 2. Rectangle   3. Triangle 4. Trapezoid 5. Sphere 6. Exit";                     

        cin>>choice;

        switch(choice)

        {

//To calculate the area of the circle

            case 1: cout<<"\nEnter the radius";

                    cin>>radius;

                    if (radius<0)                  //checking for data validity

                    {

                      cout<<"Invalid data";

                     break;

                    }

                    area=pi*radius*radius;   

                    cout<<"Area of circle:"<<area;

                    break;

//To calculate the area of the rectangle

            case 2: cout<<"\nEnter the length and width of the rectangle";

                  cin>>length>>width;

                    if ( length<0 || width<0) //checking for data validity

                    {

                        cout<<"Invalid data";

                        break;

                    }

                    area=length*width;

                    cout<<"Area of rectangle:"<<area;

                    break;

//To calculate the area of the triangle

            case 3: cout<<"\nEnter the height and base of the Triangle";

                    cin>>height>>base;

                    if ( height<0 ||base<0)             //checking for data validity

                    {

                        cout<<"Invalid data";

                        break;

                    }

                    area=height*base*0.5;       

                    cout<<"Area of Triangle:"<<area;

                    break;

//To calculate the area of the Trapezoid

            case 4: cout<<"\nEnter the height and two base lengths of the Trapezoid";

                    cin>>height>>base1>>base2;

                    if ( height<0 || base1<0 || base2<0)           //checking for data validity

                    {

                        cout<<"Invalid data";

                        break;

                    }

                    area=height*0.5*(base1+base2);       

                    cout<<"Area of Trapezoid:"<<area;

                    break;

//To calculate the area of the sphere

            case 5: cout<<"\nEnter the radius";

                    cin>>radius;

                    if (radius<0) //checking for data validity

                    {

                        cout<<"Invalid data";

                        break;

                    }

                    area=4*pi*radius*radius;

                    cout<<"Area of sphere:"<<area;

                    break;

// To exit from the menu

            case 6: break;

//Checking for invalid choice

            default: cout<<"invalid choice. Enter a valid choice";

        }

        cout<<"Do you want to continue(y/n)";

        cin>>ans;

    }while(ans=='y');

    return 0;

}

o/p

Enter your shape 1. Circle  2. Rectangle   3. Triangle  4. Trapezoid  5. Sphere 6. Exit2                                         

                                                                                                                                 

Enter the length and width of the rectangle2                                                                                     

3                                                                                                                                

Area of rectangle:6Do you want to continue(y/n)y                                                                                 

Enter your shape 1. Circle  2. Rectangle   3. Triangle  4. Trapezoid  5. Sphere 6. Exit3                                         

                                                                                                                                 

Enter the height and base of the Triangle -8 5                                                                                    

Invalid dataDo you want to continue(y/n) y                                                                                        

Enter your shape 1. Circle  2. Rectangle   3. Triangle  4. Trapezoid  5. Sphere 6. Exit3                                         

                                                                                                                                 

Enter the height and base of the Triangle3                                                                                       

5                                                                                                                                

Area of Triangle:7.5 Do you want to continue(y/n)y                                                                                

Enter your shape 1. Circle  2. Rectangle   3. Triangle  4. Trapezoid  5. Sphere 6. Exit5                                         

                                                                                                                                 

Enter the radius3                                                                                                                

Area of sphere:113.04 Do you want to continue(y/n)y                                                                               

Enter your shape 1. Circle  2. Rectangle   3. Triangle  4. Trapezoid  5. Sphere 6. Exit 8                                         

invalid choice. Enter a valid choice Do you want to continue(y/n)y                                                                

Enter your shape 1. Circle  2. Rectangle   3. Triangle  4. Trapezoid  5. Sphere 6. Exit 6                                         

Do you want to continue(y/n) n