method

sub

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sub(p1, p2) public

sub(value, digits) -> bigdecimal

Subtract the specified value.

e.g.

c = a.sub(b,n)

digits

If specified and less than the number of significant digits of the

result, the result is rounded to that number of digits, according to BigDecimal.mode.

Show source

static VALUE
BigDecimal_sub2(VALUE self, VALUE b, VALUE n)
{
    ENTER(2);
    Real *cv;
    SIGNED_VALUE mx = GetPositiveInt(n);
    if (mx == 0) return BigDecimal_sub(self, b);
    else {
        size_t pl = VpSetPrecLimit(0);
        VALUE   c = BigDecimal_sub(self, b);
        VpSetPrecLimit(pl);
        GUARD_OBJ(cv, GetVpValue(c, 1));
        VpLeftRound(cv, VpGetRoundMode(), mx);
        return ToValue(cv);
    }
}

sub

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