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instance method
BigDecimal#mult
mult(other, ndigits) → bigdecimal
ext/bigdecimal/bigdecimal.c
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static VALUE
BigDecimal_mult2(VALUE self, VALUE b, VALUE n)
{
ENTER(2);
Real *cv;
SIGNED_VALUE mx = GetPrecisionInt(n);
if (mx == 0) return BigDecimal_mult(self, b);
else {
size_t pl = VpSetPrecLimit(0);
VALUE c = BigDecimal_mult(self, b);
VpSetPrecLimit(pl);
GUARD_OBJ(cv, GetVpValue(c, 1));
VpLeftRound(cv, VpGetRoundMode(), mx);
return VpCheckGetValue(cv);
}
}
Returns the BigDecimal product 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:
Example
# Set the rounding mode. BigDecimal.mode(BigDecimal::ROUND_MODE, :half_up) b = BigDecimal('555555.555') b.mult(3, 0) # => 0.1666666665e7 b.mult(3, 3) # => 0.167e7 b.mult(3, 6) # => 0.166667e7 b.mult(3, 15) # => 0.1666666665e7 b.mult(3.0, 0) # => 0.1666666665e7 b.mult(Rational(3, 1), 0) # => 0.1666666665e7 b.mult(Complex(3, 0), 0) # => (0.1666666665e7+0.0i)