(07.10.23) Practice 8

#include <stdio.h>
struct shape {
    union dimensions {
        double length[2];
        float radius;
    } d;
    enum type { Circle = 1, Rectangle };
};
int main() {
    struct shape s; 
    int c;
    float area;
    scanf("%d", &c);
    if (c == Circle) {
        scanf("%f", &s.d.radius);
        area = 3.14 * s.d.radius * s.d.radius;
        printf("Area of the circle: %.4f units", area); }
    else if (c == Rectangle) {
        scanf("%lf %lf", &s.d.length[0], &s.d.length[1]);
        area = s.d.length[0] * s.d.length[1];
        printf("Area of the rectangle: %.4lf units\n", area); }
    else {
        printf("Invalid choice!\n");
    }
}