Structs and enums

+ <stdio.h>
e Kind CIRCLE, SQUARE, TRIANGLE
s Shape
  kind: Kind
  size: f64
f area(s: Shape) f64
  k:=0.0
  if s.kind == CIRCLE
    k = 3.14159
  elif s.kind == SQUARE
    k = 1
  else
    k = 0.433
  < k * s.size * s.size
f main()
  shapes: Shape[3] = {{CIRCLE, 1}, {SQUARE, 2}, {TRIANGLE, 3}}
  for i := 0; i < 3; i++
    printf("shape %d area %g\n", i, area(shapes[i]))
  < 0

#include <stdio.h>

typedef enum {
    CIRCLE,
    SQUARE,
    TRIANGLE
} Kind;

typedef struct Shape Shape;
struct Shape {
    Kind kind;
    double size;
};

double area(Shape s) {
    double k = 0.0;
    if (s.kind == CIRCLE) {
        k = 3.14159;
    } else if (s.kind == SQUARE) {
        k = 1;
    } else {
        k = 0.433;
    }
    return k * s.size * s.size;
}

int main(void) {
    Shape shapes[3] = {{CIRCLE, 1}, {SQUARE, 2}, {TRIANGLE, 3}};
    for (int i = 0; i < 3; i++) {
        printf("shape %d area %g\n", i, area(shapes[i]));
    }
    return 0;
}