How do I create this program for c++ using codeblocks or similiar program? Witho

Question

How do I create this program for c++ using codeblocks or similiar program?

Without using if else if style of coding:

For an entry of 1 calculate the area of a Circle use: Pi r ^2 You should ask for the radius of the circle then display the area and Pi is fixed at 3.14159.

For an entry of 2 calculate the area of a Rectangle use length * width. You should ask for the length and width the display the result.

For an entry of 4 calculate the area of a Triangle use base * height *.5 You should ask for the base and height and display the result.

For an entry of 4 stop the program.

Validate the number entered is between 1 and 4 and display the following statement: Error on selection. Please enter a number from 1 through 4

Validate the input numbers for calculation are positive numbers.

Explanation / Answer

#include <iostream>   //this is the header file which includes the I/O codes

using namespace std; //this is written for cout/cin part. This is customary to write in every C++ program

int main() //main function, This is the part where the execution of program starts
{
    bool end = false;
    int choice;
    float radius,length,breadth,base,height,pi = 3.14159;

    while(!end)
    {
        cout<<" MENU DRIVEN PROGRAM ";
        cout<<"1. Area of Circle ";
        cout<<"2. Area of Rectangle ";
        cout<<"3. Area of Triangle ";
        cout<<"4. Exit ";
        cout<<"Enter your choice::";
        cin>>choice;
        switch(choice)
        {
            case 1:
            cout<<"Enter radius of the circle::";
            cin>>radius;
            if(radius>0)
                cout<<"Area of the circle is "<<pi*radius*radius<<endl;
            else
                cout<<"Radius should be positive ";
            break;
          

            case 2:
            cout<<"Enter length of the Rectangle::";
            cin>>length;
            if(length>0)
            {
                cout<<"Enter breadth of the Rectangle::";
                cin>>breadth;
                if(breadth>0)
                    cout<<"Area of the Rectangle is "<<length*breadth<<endl;
                else
                    cout<<"breadth should be positive ";
            }else
            cout<<"length should be positive ";
            break;

          
            case 3:
            cout<<"Enter base of the Triangle::";
            cin>>base;
            if(base>0)
            {
                cout<<"Enter height of the Triangle::";
                cin>>height;
                if(height>0)
                    cout<<"Area of the Triangle is "<<0.5*base*height<<endl;
                else
                    cout<<"height should be positive ";
            }else
            cout<<"base should be positive ";
            break;
            case 4:
            end = true;
            break;

            default:
            cout<<"Please enter a number from 1 through 4 ";
        }
    }
}

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