Right adjust number on LCD

i want right adjust number within block. number can between 1 , 3 digits long, , 1s, 10s, , hundreds place stay in consistent spot on lcd screen. right code have doing this:

code: [select]

        int offset = ceil(log(rms+1)/log(10));
        if( offset==0 ) offset = 1;
        lcd.clear();
        lcd.setcursor( 13-offset, 1 );
        lcd.print( rms );
        lcd.print( " mw" );

i'm wondering if there's more elegant way figure out how many digits number has without using logrithms.

code: [select]

void setup()
{
  serial.begin(115200);
  (int anumber = 0; anumber < 110; anumber++)
  {
    padnumber(anumber);
    serial.println(anumber);
  }
}

void loop()
{
}

void padnumber(int numbertopad)
{
  if (numbertopad < 10)
  {
    serial.print("0");
  }

  if (numbertopad < 100)
  {
    serial.print("0");
  }
}

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