Difference between revisions of "Round"
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| − | * {{Doc|package=RTL|unit=system|identifier=round|text=<syntaxhighlight lang="pascal" | + | * {{Doc|package=RTL|unit=system|identifier=round|text=<syntaxhighlight lang="pascal" inline>system.round</syntaxhighlight>}} |
| − | * {{Doc|package=RTL|unit=math|identifier=ceil|text=<syntaxhighlight lang="pascal" | + | * {{Doc|package=RTL|unit=math|identifier=ceil|text=<syntaxhighlight lang="pascal" inline>math.ceil</syntaxhighlight>}} - round up |
| − | * {{Doc|package=RTL|unit=math|identifier=floor|text=<syntaxhighlight lang="pascal" | + | * {{Doc|package=RTL|unit=math|identifier=floor|text=<syntaxhighlight lang="pascal" inline>math.floor</syntaxhighlight>}} - round down |
| − | * [[Frac|<syntaxhighlight lang="pascal" | + | * [[Frac|<syntaxhighlight lang="pascal" inline>frac</syntaxhighlight>]] - returns the fractional part of a floating point value |
| − | * [[Trunc|<syntaxhighlight lang="pascal" | + | * [[Trunc|<syntaxhighlight lang="pascal" inline>trunc</syntaxhighlight>]] - round towards zero |
| − | * [[Int|<syntaxhighlight lang="pascal" | + | * [[Int|<syntaxhighlight lang="pascal" inline>int</syntaxhighlight>]] - returns the integer part of a floating point value |
| − | * [[Div|<syntaxhighlight lang="pascal" | + | * [[Div|<syntaxhighlight lang="pascal" inline>div</syntaxhighlight>]] - integer division |
| + | * [[Comparison of approaches for rounding to an integer]] | ||
Latest revision as of 17:17, 6 August 2022
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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 downfrac- returns the fractional part of a floating point valuetrunc- round towards zeroint- returns the integer part of a floating point valuediv- integer division- Comparison of approaches for rounding to an integer
