IGNOU BCS 131 2026 2027 - Write a C++ program that defines separate functions to: (8 Marks)a.

Question

Write a C++ program that defines separate functions to: (8 Marks)
a. Calculate the area of a circle
b. Calculate the circumference of a circle
The radius should be entered by the user from the main() function and passed to both functions.

08 Aug 2026

Answer :

Word Count : 578

A C++ program can be designed by defining two separate functions: one to calculate the area of a circle and another to calculate its circumference. The radius is entered by the user inside the `main()` function and is then passed as an argument to both functions. This demonstrates the use of user-defined functions, function arguments, return values, and modular programming in C++. The formula for the area of a circle is: Area = π × r × r The formula for the circumference is: Circumference = 2 × π × r Here, `r` represents the radius and π can be taken as `3.14159`. ```cpp #include using namespace std; // Function to calculate the area of a circle double calculateArea(double radius) { return 3.14159 * radius * radius; } // Function to calculate the circumference of a circle double calculateCircumference(double radius) { return 2 * 3.14159 * radius; } int main() { double radius; // Enter radius from the user cout << "Enter the radius of the circle: "; cin >> radius; // Calling both functions and passing radius

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