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

int main()
{
  unsigned int ip[2];
  unsigned char *c, *vp;
  int v;

  vp = (unsigned char *) &v;
  c = (unsigned char *) ip;

  c[0] = 0x21;
  c[1] = 0x91;
  c[2] = 0x86;
  c[3] = 0x99;
  c[4] = 0x06;
  c[5] = 0x51;
  c[6] = 0x79;
  c[7] = 0x74;

  printf("0: 0x%08x\n", ip[0]);
  printf("1: 0x%08x\n", ip[1]);

  memcpy(vp, ip, 2);
  memcpy(vp+2, ip+1, 2);

  printf("2: 0x%08x\n", v);
  printf("3: 0x%02x 0x%02x 0x%02x 0x%02x\n", vp[0], vp[1], vp[2], vp[3]);

  memcpy(&v, c+2, 4);
  v += 0x01100220;
  printf("4: 0x%02x 0x%02x 0x%02x 0x%02x\n", vp[0], vp[1], vp[2], vp[3]);

  return 0;
}