## Introduction

I have used Code::blocks 12 compiler for debugging purpose. But you can use any C programming language compiler as per your availability.

#include <stdio.h> #include <math.h> //All Function declaration double getDiameter(double radius); double getCircumference(double radius); double getArea(double radius); int main() { float radius, diameter, circle, area; // Inputting radius of circle from user printf("Enter radius of circle: "); scanf("%f", &radius); diameter = getDiameter(radius); // Calling getDiameter function circle = getCircumference(radius); // Calling getCircumference function area = getArea(radius); // Calling getArea function printf("Diameter of the circle = %.2f units\n", diameter); printf("Circumference of the circle = %.2f units\n", circle); printf("Area of the circle = %.2f sq. units", area); return 0; } // Calculating diameter of circle whose radius is given double getDiameter(double radius) { return (2 * radius); } //Calculating circumference of circle whose radius is given double getCircumference(double radius) { return (2 * M_PI * radius); // PI = 3.14 } //Finding area of circle whose radius is given double getArea(double radius) { return (M_PI * radius * radius); // PI = 3.14 }