Difference between revisions of "Round"
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{{Round}} | {{Round}} | ||
| − | The [[RTL]] [[System unit]] contains function '''Round''', which rounds a [[Real]]-type value to an [[Integer]]-type value. | + | The [[RTL]] [[System unit]] contains [[Function|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 [[ | + | 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 == | |
| − | |||
| − | <syntaxhighlight> | + | <syntaxhighlight lang="pascal"> |
| + | function Round(X: Real): int64; | ||
| + | </syntaxhighlight> | ||
| + | |||
| + | == Example Usage == | ||
| + | |||
| + | <syntaxhighlight lang="pascal"> | ||
begin | begin | ||
WriteLn( Round(8.7) ); | WriteLn( Round(8.7) ); | ||
| Line 17: | Line 22: | ||
</syntaxhighlight> | </syntaxhighlight> | ||
| − | + | === Output === | |
| − | 9 | + | |
| − | 8 | + | 9 |
| − | 2 | + | 8 |
| − | 4 | + | 2 |
| + | 4 | ||
| + | |||
| + | == See also == | ||
| − | |||
| − | |||
| − | |||
| − | |||
| − | [[ | + | * {{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" inline>math.ceil</syntaxhighlight>}} - round up | ||
| + | * {{Doc|package=RTL|unit=math|identifier=floor|text=<syntaxhighlight lang="pascal" inline>math.floor</syntaxhighlight>}} - round down | ||
| + | * [[Frac|<syntaxhighlight lang="pascal" inline>frac</syntaxhighlight>]] - returns the fractional part of a floating point value | ||
| + | * [[Trunc|<syntaxhighlight lang="pascal" inline>trunc</syntaxhighlight>]] - round towards zero | ||
| + | * [[Int|<syntaxhighlight lang="pascal" inline>int</syntaxhighlight>]] - returns the integer part of a floating point value | ||
| + | * [[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
