Area of Circle

 #include <stdio.h>

#include <math.h>

int main() {
    double radius, area;

    printf("Enter the radius of the circle: ");
    scanf("%lf", &radius);

    if (radius >= 0) {
        area = M_PI * radius * radius; // M_PI is a constant for the value of π
        printf("The area of the circle with radius %.2lf is %.2lf\n", radius, area);
    } else {
        printf("Invalid radius. Please enter a non-negative value.\n");
    }

    return 0;
}

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