SS 2025

2025_Praxis_der_Programmierung/point_3.c

@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+struct point {
+  float x;
+  float y;
+};
+
+
+void move(struct point * punkt, float dx, float dy) {
+  punkt->x += dx;
+  punkt->y += dy;
+}
+
+
+int main() {
+  struct point * ptr;
+
+  ptr = malloc(sizeof(struct point));  // impl. Typcast des Pointers
+   
+  if (ptr != NULL) {
+    ptr->x = 10;
+    ptr->y = 20;
+
+    printf("\nx-Koordinate von p: %f", ptr->x);
+    printf("\ny-Koordinate von p: %f", ptr->y);
+
+    free(ptr);
+
+    printf("\n");
+    printf("\nnach free():");
+    
+    // Dangling Pointer!
+    printf("\nx-Koordinate von p: %f", ptr->x);
+    printf("\ny-Koordinate von p: %f", ptr->y);
+
+    printf("\n\n");
+  }
+  return 0;
+}
+