Method: BigDecimal#add

Defined in:

bigdecimal.c

#add(value, ndigits) ⇒ Object

Returns the BigDecimal sum of self and value with a precision of ndigits decimal digits.

When ndigits is less than the number of significant digits in the sum, the sum is rounded to that number of digits, according to the current rounding mode; see BigDecimal.mode.

Examples:

# Set the rounding mode.
BigDecimal.mode(BigDecimal::ROUND_MODE, :half_up)
b = BigDecimal('111111.111')
b.add(1, 0)               # => 0.111112111e6
b.add(1, 3)               # => 0.111e6
b.add(1, 6)               # => 0.111112e6
b.add(1, 15)              # => 0.111112111e6
b.add(1.0, 15)            # => 0.111112111e6
b.add(Rational(1, 1), 15) # => 0.111112111e6

# File 'bigdecimal.c', line 2290

static VALUE
BigDecimal_add2(VALUE self, VALUE b, VALUE n)
{
    ENTER(2);
    Real *cv;
    SIGNED_VALUE mx = check_int_precision(n);
    if (mx == 0) return BigDecimal_add(self, b);
    else {
	size_t pl = VpSetPrecLimit(0);
	VALUE   c = BigDecimal_add(self, b);
	VpSetPrecLimit(pl);
	GUARD_OBJ(cv, GetVpValue(c, 1));
	VpLeftRound(cv, VpGetRoundMode(), mx);
        return VpCheckGetValue(cv);
    }
}