Make a simple program in c++ languaage that asks a user to enter a number from t

Question

Make a simple program in c++ languaage that asks a user to enter a number from the keyboard (this number could have a fractional part). You should prompt the user to enter a value from the keyboard, so there is no confusion. Your program should then interpret this number as the radius of a circle and show both the area and circumference. In case you forgot here are the formulas:

• Area of circle: r2

• Circumference of circle: 2r

Example 1 (user input is underlined): Enter the radius of a circle: 3 Area: 28.2743 Circumference: 18.8496

Explanation / Answer

#include<iostream>

using namespace std;

int main()

{

//Declaring variables

const float PI = 3.14;

            float radius;

            double area;

              double circumference;

            cout << " C++ Program to Find Area of Circle and circumference" << endl;

            cout << " Enter Radius : ";

            cin >> radius;

            area = PI * radius * radius;

              circumference=2*PI*radius

            cout << " Area of Circle  = " << area << endl;

       cout << " circumference of Circle  = " << circumference << endl;

            cin.ignore();

            cin.get();

            return 0;

}

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