Untitled

#include <stdio.h>
int main() {
    double r, diameter, circumference, area;

    printf("Enter the radius of the circle: ");
    scanf("%lf", &r);
    diameter = 2*r;
    circumference = 2*22.0/7*r;
    
    printf("Diameter of the circle: %.2lf\n", diameter);
    printf("Circumference of the circle: %.2lf\n", circumference);
    printf("Area of the circle: %.2lf\n", area);
}