C PROGRAM: TO CALCULATE CIRCUMFERENCE OF CIRCLE

CODING:
#include<conio.h>
#include<stdio.h>
#define PI 3.14
void main()
{
    float cm,r;
    clrscr();
    printf("Enter radius of circle: ");
    scanf("%f",&r);
    cm=2*PI*r;
    printf("\n\nCircumference of circle is %.2f",cm);
    getch();
}

CODING

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OUTPUT

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