What is happening on line 16, is the value or the address being incremented?

INTRODUCTION TO OPERATING SYSTEMS 5 1 2. #include #include #include #include "common.h" 3 4 5 6 7 8 9 int *p = // al 10 11 12 // a2 // a 3 13 int main (int argc, char *argv[]) { malloc(sizeof (int)); assert (p != NULL); printf(" (d) address pointed to by p: %p ", getpid(), p); *p = 0; while (1) { Spin (1); *P = *p + 1; printf("(%d) p: %d ", getpid(), *p); } return 0; } Figure 2.3: A Program That Accesses Memory (mem.c) 14 15 16 17 // a4 18 19 20