## Introduction

I have used CodeBlocks compiler for debugging purpose. But you can use any C++ programming language compiler as per your availability.

#include <iostream> #include <math.h> using namespace std; //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 cout<<"Enter radius of circle: "; cin>>radius; diameter = getDiameter(radius); // Calling getDiameter function circle = getCircumference(radius); // Calling getCircumference function area = getArea(radius); // Calling getArea function cout<<"Diameter of the circle: "<<diameter <<" units"<<endl; cout<<"Circumference of the circle: "<< circle<<" units"<<endl; cout<<"Area of the circle:"<< area<<" sq. units"<<endl; 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 }