#include <stdio.h>

// When using this header file across programs,
// the following will prevent multiple inclusions
// of prototypes provided here
#ifndef GEOMETRIC_OBJECTS_H
#define GEOMETRIC_OBJECTS_H

typedef struct {
  float radius;
} Circle;

typedef struct {
  float length;
  float width;
} Triangle;

float circle_area( Circle );

float triangle_area( Triangle );

#endif