#include <stdio.h>
#include <math.h>

struct point {
    float x;
    float y;
};

struct circle {
    struct point center;
    float radius;
    float circumference;
    float area;
};

struct circle read_circle();

struct circle complete_circle(struct circle circle);

int main(void) {
    struct circle circle;
    circle = read_circle();
    circle = complete_circle(circle);

    printf("Circumference: %f\n", circle.circumference);
    printf("Area: %f\n", circle.area);
    return 0;
}

struct circle read_circle() {
    struct circle circle;
    printf("gimme da circ (<x,y> r): ");
    char buf[256] = {0};
    fgets(buf, sizeof(buf) / sizeof(buf[0]), stdin);
    sscanf(buf, "<%f,%f> %f", &circle.center.x, &circle.center.y, &circle.radius);
    return circle;
}

struct circle complete_circle(struct circle circle) {
    circle.circumference = M_PI * 2 * circle.radius;
    circle.area = M_PI * circle.radius * circle.radius;
    return circle;
}