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Returns the largest number less than or equal to self with a precision of ndigits decimal digits.
When ndigits is negative, the returned value has at least ndigits.abs trailing zeros:
555.floor(-1)  # => 550
555.floor(-2)  # => 500
-555.floor(-2) # => -600
555.floor(-3)  # => 0
Returns self when ndigits is zero or positive.
555.floor     # => 555
555.floor(50) # => 555
Related: Integer#ceil.
 
               static VALUE
int_floor(int argc, VALUE* argv, VALUE num)
{
    int ndigits;

    if (!rb_check_arity(argc, 0, 1)) return num;
    ndigits = NUM2INT(argv[0]);
    if (ndigits >= 0) {
        return num;
    }
    return rb_int_floor(num, ndigits);
}
            

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