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Write a program to find the circumference of a circle

Write a c++ program to calculate the cricumference of a circle.

For this program we need the value of radius so we take the value of r from user then calculate the circumference of a circle.

*#include<iostream.h> *
* #include<stdio.h> *
* *
*void main() *
*{ *
* *
* float r,circumference; // Declare variable *
*cout<<"Enter radius of a circle";*
*cin>>r; *

*circumference=2*3.14*r; *
*cout<<"circumference of a circle is"<<circumference; *
* *
* getch(); *
* *
*} *

C/C++ programs

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