java - PHP integer part padding

Question

I need to pad the integer part with 0, the integer part must be at least 2 characters

str_pad( 2    ,2,"0",STR_PAD_LEFT);// 02 -> works
str_pad( 22   ,2,"0",STR_PAD_LEFT);// 22 -> works
str_pad( 222  ,2,"0",STR_PAD_LEFT);// 222-> works
str_pad( 2.   ,2,"0",STR_PAD_LEFT);// 2. -> fails -> 02. or 02
str_pad( 2.11 ,2,"0",STR_PAD_LEFT);// 2.11-> fails -> 02.11

Is there simple code for that?

If possible the same in Java please

double x=2.11;
String.format("%02d%s", (int) x, String.valueOf(x-(int) x).substring(1))

is not only ugly but prints 02.10999999999999988

edit for Java: Java integer part padding

Answer 1

No, there is no simple way.

function padIntegerPart($n, $len) {
    $intPart = (int)$n;

    return str_repeat('0', max(0, $len - 1 - floor(log($intPart, 10)))) . $n;
}