Ada Programming/Attributes/'Remainder
Description
[edit | edit source]X'Remainder(Y,Z) is an Ada attribute where X is any floating-point type and Y,Z are any instances of that type. This attribute represents the fractional part of this result. Z should never be zero.
The sign of Y may or may not be the same as the sign of the result.
Example
[edit | edit source]type Real is digits 15; Real'Remainder (7.5, 2.3); -- returns 0.6 Real'Remainder (42.97482350828000, 6.283185307179586); -- returns -1.00747364197711
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-- Mod function for real numbers
--
-- x = The number whose remainder is desired
-- y = The divisor
--
-- We return x mod y with the same sign as y.
--------------------------------------------------------------------------------
function "mod" (x, y : Real) return Real is
result : Real := Real'Remainder (x, y);
begin
if y > 0.0 then
if result < 0.0 then
result := result + y;
end if;
else
if result > 0.0 then
result := result + y;
end if;
end if;
return result;
end "mod";
--------------------------------------------------------------------------------------------------
-- Rem function for real numbers
--
-- x = The number whose remainder is desired
-- y = The divisor
--
-- We return x mod y with the same sign as x.
--------------------------------------------------------------------------------------------------
function "rem" (x, y : Real) return Real is
result : Real := Real'Remainder (x, y);
begin
if x > 0.0 then
if result < 0.0 then
result := result + abs y;
end if;
else
if result > 0.0 then
result := result - abs y;
end if;
end if;
return result;
end "rem";
See also
[edit | edit source]Wikibook
[edit | edit source]- Ada Programming
- Ada Programming/Attributes
- Ada Programming/Attributes/'Rounding
- Ada Programming/Attributes/'Truncation
- Ada Programming/Attributes/'Unbiased_Rounding