#include <stdio.h>

typedef struct pixel {
   int x, y;
   char color;
} Pixel;

void print_pixel(Pixel p);
void increase_x_and_y(Pixel *p, int delta);

void print_pixel(Pixel p) {
   printf("x: %d, y: %d, color: %c\n", p.x, p.y, p.color);
}

void increase_x_and_y(Pixel *p, int delta) {
   p->x += delta;   /* Do not access member using (*p).x */
		    /* Do not leave space p -> x */
}

int main() {
   Pixel p1 = {1, 2, 'r'};
   
   increase_x_and_y(&p1, 300);
   print_pixel(p1);

   return 0;
}