Difference between revisions of "Round"
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* {{Doc|package=RTL|unit=math|identifier=ceil|text=<syntaxhighlight lang="pascal" enclose="none">math.ceil</syntaxhighlight>}} - round up | * {{Doc|package=RTL|unit=math|identifier=ceil|text=<syntaxhighlight lang="pascal" enclose="none">math.ceil</syntaxhighlight>}} - round up | ||
* {{Doc|package=RTL|unit=math|identifier=floor|text=<syntaxhighlight lang="pascal" enclose="none">math.floor</syntaxhighlight>}} - round down | * {{Doc|package=RTL|unit=math|identifier=floor|text=<syntaxhighlight lang="pascal" enclose="none">math.floor</syntaxhighlight>}} - round down | ||
| + | * [[Frac|<syntaxhighlight lang="pascal" enclose="none">trunc</syntaxhighlight>]] - returns the fractional part of a floating point value | ||
* [[Trunc|<syntaxhighlight lang="pascal" enclose="none">trunc</syntaxhighlight>]] - round towards zero | * [[Trunc|<syntaxhighlight lang="pascal" enclose="none">trunc</syntaxhighlight>]] - round towards zero | ||
| − | * [[Int|<syntaxhighlight lang="pascal" enclose="none">int</syntaxhighlight>]] - returns the integer part of floating point value | + | * [[Int|<syntaxhighlight lang="pascal" enclose="none">int</syntaxhighlight>]] - returns the integer part of a floating point value |
* [[Div|<syntaxhighlight lang="pascal" enclose="none">div</syntaxhighlight>]] - integer division | * [[Div|<syntaxhighlight lang="pascal" enclose="none">div</syntaxhighlight>]] - integer division | ||
Revision as of 11:17, 18 August 2019
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The RTL System unit contains function Round, which rounds a Real-type value to an Integer-type value. It's input parameter is a real-type expression and Round returns a Int64 value that is the value of the input rounded to the nearest whole number. If the input value is exactly halfway between two whole numbers - N.5 - then "bankers rounding" is used, with the result being the nearest even number.
Declaration
function Round(X: Real): int64;
Example Usage
begin
WriteLn( Round(8.7) );
WriteLn( Round(8.3) );
// examples of "bankers rounding" - .5 is adjusted to the nearest even number
WriteLn( Round(2.5) );
WriteLn( Round(3.5) );
end.
Output
9 8 2 4
See also
system.roundmath.ceil- round upmath.floor- round downtrunc- returns the fractional part of a floating point valuetrunc- round towards zeroint- returns the integer part of a floating point valuediv- integer division
