feat: update structure

cs2106/labs/lab1/part3/lab1p3a.c

@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int *p;
+
+void dfun1(int x, int y)
+{
+	int *z;
+
+	z = (int *) malloc(sizeof(int));
+
+	p = z;
+	*z = x + y;
+
+	printf("Inside dfun1: &x = %p, &y = %p, &z = %p, &p = %p\n", &x, &y, &z, &p);
+	printf("Address stored in z: %p\n", z);
+}
+
+void dfun2() {
+	printf("Inside dfun2: The value p is pointing to is: %d\n", *p);
+}
+
+int main() {
+	printf("Address stored in p before calling dfun1: %p\n", p);
+	dfun1(10, 20);
+	printf("Address stored in p after calling dfun1: %p\n", p);
+	printf("Value pointed to by p: %d\n", *p);	
+	dfun2();
+	free(p);
+}