/* mem.c -- illustrate memory addresses, layout of C program */

#include <stdio.h>
#include <stdlib.h>

double pi = 3.14;

void fun1(int, int, int, int, int, int, int, int, int, int);
void fun2(int);
void fun3(int);

int main()
{
  int a, b, c[257], *p;
  p = malloc(sizeof(int));

  printf("starting main()\n");
  printf("  address of pi          %8x\n", &pi);
  printf("  address of a           %8x\n", &a);
  printf("  address of b           %8x\n", &b);
  printf("  address of c[0]        %8x\n", &c[0]);
  printf("  address of c[256]      %8x\n", &c[256]);
  printf("  address of pointer p   %8x\n", &p);
  printf("  address value in p     %8x\n", p);
  printf("  address of fun1        %8x\n", (unsigned) fun1);
  printf("  address of fun2        %8x\n", (unsigned) fun2);
  printf("  address of fun3        %8x\n", (unsigned) fun3);

  fun1(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
  return 0;
}

void fun1(int a, int b, int c, int d, int e, int f, int g, int h, int i, int j)
{
  int *p;
  p = malloc(sizeof(int));

  printf("starting fun1()\n");
  printf("  address of param a     %8x\n", &a);
  printf("  address of param j     %8x\n", &j);
  printf("  address of pointer p   %8x\n", &p);
  printf("  address value in p     %8x\n", p);

  fun2(a+b+c+d+e+f+g+h+i+j);
}

void fun2(int n)
{
  int a[65536], *p;
  p = calloc(65536, sizeof(int));

  printf("starting fun2()\n");
  printf("  address of param n     %8x\n", &n);
  printf("  address of local a[0]  %8x\n", &a[0]);
  printf("  address of a[65535]    %8x\n", &a[65635]);
  printf("  address of pointer p   %8x\n", &p);
  printf("  address value in p     %8x\n", p);
  printf("  address of p[65535]    %8x\n", &p[65535]);

  fun3(16);
}

void fun3(int n)
{
  int a[16], *p;
  p = calloc(n, sizeof(int));

  printf("starting fun3()\n");
  printf("  address of param n     %8x\n", &n);
  printf("  address of local a[0]  %8x\n", &a[0]);
  printf("  address of pointer p   %8x\n", &p);
  printf("  address value in p     %8x\n", p);
}

/* output...
starting main()
  address of pi            601050
  address of a           b5ad7abc
  address of b           b5ad7ab8
  address of c[0]        b5ad76b0
  address of c[256]      b5ad7ab0
  address of pointer p   b5ad76a8
  address value in p      132c010
  address of fun1          40076a
  address of fun2          40082f
  address of fun3          40090e
starting fun1()
  address of param a     b5ad765c
  address of param j     b5ad7698
  address of pointer p   b5ad7668
  address value in p      132c030
starting fun2()
  address of param n     b5a9761c
  address of local a[0]  b5a97630
  address of a[65535]    b5ad77bc
  address of pointer p   b5a97628
  address value in p     fc7d6010
  address of p[65535]    fc81600c
starting fun3()
  address of param n     b5a975ac
  address of local a[0]  b5a975c0
  address of pointer p   b5a975b8
  address value in p      132c050
*/