The program is given below in C++ with a user defined function to calculate circumference of a circle.
#include <iostream>
#define PI 3.14
using namespace std;
void Cal_Crcmfrnc(float); // function prototype
int main()
{
float radius; // declaring variable
cout<< "Enter Radius : "; // prompting for input
cin>> radius; //
Cal_Crcmfrnc(radius); // function call
return 0;
}
void Cal_Crcmfrnc(float rds) // function definition
{
float crcumference; //declaring variable
crcumference = 2 * PI * rds; // calculating circumference
cout<< "Circumference of the Circle : " << crcumference; //displaying output
}
Here, in the attachment the complete program with output is provided.
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