I disagree. There are a few cases where a number is more expressive - I even think MISRA has exemptions for 1, 0 and FF.

But in most cases what I want is not the number, it's the _meaning_ of the number. Be it the Command ID, ram block Address or whatever it is. Generally, having code sprinkled with magic numbers is pretty shitty.

In my view:

  a = a<<18;
  a |= b<<8;
  a |= c;

is a kosher use of numbers. But

  case(ChoiceID):
    switch 1:
      /* Do somethin'*/
    break;
    switch 26:
      /* Do somethin' else*/
    break;
    default:
    break;

is not. Generally, numbers are ok as long as you express mathematical ideas nut not ok when you express logical ideas.