method

sub

v2_5_5 - Show latest stable - Class: BigDecimal

sub(p1, p2)

public

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.

static VALUE
BigDecimal_sub2(VALUE self, VALUE b, VALUE n)
{
    ENTER(2);
    Real *cv;
    SIGNED_VALUE mx = GetPrecisionInt(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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