first commit!

struct_beginning.c

@@ -0,0 +1,55 @@
+#include <stdio.h>
+#include <stdlib.h>
+struct point {
+  int x;
+  int y;
+};
+
+struct {
+  int x;
+  int y;
+} point2;
+
+struct point3 pt;
+
+struct point3 {
+  int x;
+  int y;
+};
+
+struct rect {
+  struct point pt1;
+  struct point pt2;
+};
+
+struct point makepoint(int, int);
+struct point *makepoint_p(int, int);
+
+int main() {
+  struct point p = {2, 3};
+  printf("x: %d, y: %d\n", p.x, p.y);
+
+  struct rect r1 = {{2, 3}, {3, 4}};
+  printf("pt1.x: %d, pt1.y: %d, pt2.x: %d, pt2.y: %d\n", r1.pt1.x, r1.pt1.y,
+         r1.pt2.x, r1.pt2.y);
+
+  struct point p2 = makepoint(3, 4);
+  printf("x: %d, y: %d\n", p2.x, p2.y);
+
+  struct point *p3 = makepoint_p(3, 4);
+  printf("x: %d, y: %d\n", p3->x, p3->y);
+  free(p3);
+}
+
+struct point makepoint(int x, int y) {
+  struct point p = {x, y};
+  return p;
+}
+
+struct point *makepoint_p(int x, int y) {
+  struct point *p = malloc(sizeof(struct point));
+  p->x = x;
+  p->y = y;
+
+  return p;
+}