Write a program Area of circle.

//Area of Circle......

#include<stdio.h>

#include<conio.h>

void main()

{

    int pi=3.14,r;

    float circle;

    printf("\n Enter your radius=");

    scanf("%d",&r);

    circle=pi*r*r;

    printf("\n Area of circle=%f",circle);

    getch();

}

Output:-

Enter your radius=2 Area of circle=12.000000

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