method

round

v1_9_1_378 - Show latest stable - 0 notes - Class: Float

round(p1 = v1) public

Rounds flt to a given precision in decimal digits (default 0 digits). Precision may be negative. Returns a a floating point number when ndigits is more than one.

1.5.round      #=> 2
(-1.5).round   #=> -2

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static VALUE
flo_round(int argc, VALUE *argv, VALUE num)
{
    VALUE nd;
    double number, f;
    int ndigits = 0, i;
    long val;

    if (argc > 0 && rb_scan_args(argc, argv, "01", &nd) == 1) {
        ndigits = NUM2INT(nd);
    }
    number  = RFLOAT_VALUE(num);
    f = 1.0;
    i = abs(ndigits);
    while  (--i >= 0)
        f = f*10.0;

    if (isinf(f)) {
        if (ndigits < 0) number = 0;
    }
    else {
        if (ndigits < 0) number /= f;
        else number *= f;
        number = round(number);
        if (ndigits < 0) number *= f;
        else number /= f;
    }

    if (ndigits > 0) return DBL2NUM(number);

    if (!FIXABLE(number)) {
        return rb_dbl2big(number);
    }
    val = number;
    return LONG2FIX(val);
}

round

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