IGNOU BCS 31 2026 2027 - Write a C++ program that defines separate functions to: a. Calculate t

Question

Write a C++ program that defines separate functions to: a. Calculate the area of a circle b. Calculate the circumference of a circle

08 Aug 2026

Answer :

Word Count : 929

A C++ program can be designed using separate functions to calculate the area and circumference of a circle. Using separate functions makes the program easier to understand, test, and reuse. The program can take the radius of the circle as input from the user and then pass that radius to two different functions. One function will calculate the area, while the other will calculate the circumference. The mathematical formula for the area of a circle is: Area = π × r × r where `r` represents the radius of the circle. The formula for the circumference of a circle is: Circumference = 2 × π × r In C++, the value of π can be represented using `M_PI` from the `` header on systems where it is available. To make the program more portable, we can also define our own constant value for π, such as `3.141592653589793`. The following program uses two separate functions, `calculateArea()` and `calculateCircumference()`, to perform the required calculations: ```cpp #include using namespace std; const double PI = 3.141592653589793; // Function to calculate the area of a circle double calculateArea(double radius) { return PI * radius * radius; } // Function to calculate the circumference of a circle double calculateCircumference(double radius) { return 2 * PI * radius; } int

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