C interface pattern showcase project
This project defines a shape_interface structure with three "virtual" functions: type, area, perimiter.
There are two "derived" structures: circle and rectangle which "implement" the shape_interface.
In the main.c file there is a function print_shape_params which takes the interface and the object as parameters and prints the values of all three interface functions.
> gcc -o shapes app/main.c source/*.c -I include/
> ./shapes