C lang samples

fn_pointer.c

#include <stdio.h>
#include <stdbool.h>

typedef int (*Operator)(int a, int b);

int add(int a, int b) {
  return(a + b);
}

int mult(int a, int b) {
  return(a * b);
}


int main(void) {
  int a, b, c;
  Operator op;
  a = 2, b = 3;
  op = false ? &add : &mult;
  c = (op)(a, b);
  printf("Answer is %d\n", c);
  return 0;
}

struct.c

#include <stdio.h>
struct Point {
  int x, y; 
};
struct Size {
  int width, height; 
};
struct Rectangle {
  struct Point point;
  struct Size size;
};

int main(void) {
  struct Rectangle rect = {
    .point = {
      .x = 20,
      .y = 50 
    }, 
    .size  = {
      .width = 300,
      .height = 400 
    }
  };
  printf(
    "(%d, %d)\n(%d, %d)\n",
    rect.point.x, rect.point.y,
    rect.size.width, rect.size.height
  );
  return 0;
}