c,cc/bitwise.c


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#include <stdio.h>


void
test1()
{
  int foo[4] = {147, 142, 207, 19};
  unsigned long result = 0;

  for( int i = 0; i < 4; i += 1 )
  {
    result = result<<8;  // 8 bit left
    result = foo[i]|result;
  }

  printf("%lx\n", result);
}

void
test2(void)
{
  int foo[4];
  unsigned long bar = 0x938ecf13;

  for( int i = 0; i < 4; i += 1 )
  {
    foo[i] = (bar>>i*8)&255;

    printf("%d\n", foo[i]);
  }
}

void
test3(void)
{
  int s = 12;
  unsigned long foo = 0xffffffff;

  foo = foo<<s;
  printf("%lx\n", foo);
}

int main(void)
{
  test1();
  test2();
  test3();

  return 0;
}