function arguments by reference

practice/lc_functionArgsByReference.c

@@ -5,11 +5,47 @@ void addone(int n)
     n++;
 }
 
+void addoneByRef(int* n)
+{
+    (*n)++; 
+}
+
+typedef struct
+{
+    int x;
+    int y;
+} Point;
+
+void move1(Point* p)
+{
+    (*p).x++;
+    (*p).y++;
+}
+
+// 약어
+void move2(Point* p)
+{
+    p->x++;
+    p->y++;
+}
+
 int main()
 {
     int n = 0;
     printf("Step0: %d\n", n);
     addone(n);
     printf("Step2: %d\n", n);
+    addoneByRef(&n);
+    printf("Step2: %d\n", n);
+
+    printf("\n");
+
+    Point pt = { 1, 1 };
+    printf("Step0 pt.x: %d, pt.y: %d\n", pt.x, pt.y);
+    move1(&pt);
+    printf("Step1 pt.x: %d, pt.y: %d\n", pt.x, pt.y);
+    move2(&pt);
+    printf("Step2 pt.x: %d, pt.y: %d\n", pt.x, pt.y);
 
+    return 0;
 }