feat: update structure

cs2106/labs/lab1/part1/lab1p1a.c

@@ -0,0 +1,31 @@
+#include <stdio.h>
+
+int (*fptr)(int);
+
+int func(int x) {
+    return 2 * x;
+}
+
+
+int y = 10;
+
+int *(*pfptr)();
+
+int *func2() {
+    return &y;
+}
+
+int main() {
+    printf("Calling func with value 6: %d\n", func(6));
+    printf("Now setting fptr to point to func.\n");
+    fptr = func;
+    printf("Caling fptr with value 6: %d\n", fptr(6));
+
+    printf("\nNow caling func2 which returns the address of global variable y: %p\n", func2());
+    printf("Pointing pfptr to func2.\n");
+    pfptr = func2;
+    printf("Now calling fpfptr: %p\n", pfptr());
+}
+
+
+