# C++ Exercises: Accepts the radius of a circle from the user and compute the area and circumference

## C++ Basic: Exercise-43 with Solution

Write a C++ program that accepts the radius of a circle from the user and computes the area and circumference.

**Visual Presentation:**

**Sample Solution**:

**C++ Code :**

```
#include <iostream> // Including the input-output stream header file
#define PI 3.14159 // Defining a constant PI with the value 3.14159
using namespace std; // Using the standard namespace
int main() // Start of the main function
{
float radius, area, circum; // Declaring variables to store radius, area, and circumference
cout << "\n\n Find the area and circumference of any circle :\n"; // Outputting a message indicating the purpose of the program
cout << "----------------------------------------------------\n"; // Displaying a separator line
cout << " Input the radius(1/2 of diameter) of a circle : "; // Prompting the user to input the radius of the circle
cin >> radius; // Reading the radius from the user
circum = 2 * PI * radius; // Calculating the circumference of the circle using the formula: 2 * PI * radius
area = PI * (radius * radius); // Calculating the area of the circle using the formula: PI * (radius^2)
cout << " The area of the circle is : " << area << endl; // Outputting the calculated area of the circle
cout << " The circumference of the circle is : " << circum << endl; // Outputting the calculated circumference of the circle
cout << endl; // Displaying an empty line for better readability
return 0; // Return statement indicating successful completion of the program
}
```

Sample Output:

Find the area and circumference of any circle : ---------------------------------------------------- Input the radius(1/2 of diameter) of a circle : 5 The area of the circle is : 78.5397 The circumference of the circle is : 31.4159

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