Difference between revisions of "LlRound"
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Pedro Oval (talk | contribs) (Not an accuracy issue. N.5 is always exactly representable. It's just the behavior for negatives. Document it.) |
Frionil Fang (talk | contribs) (same applies to round as it does for floor for positive values, faster to just +0.5 and truncate to int) |
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* The returned value is -2147483648 (0x80000000) if the arithmetic result is outside of the range of valid integers (-2147483648 to 2147483647 inclusive). | * The returned value is -2147483648 (0x80000000) if the arithmetic result is outside of the range of valid integers (-2147483648 to 2147483647 inclusive). | ||
|constants | |constants | ||
|examples=< | |examples=<syntaxhighlight lang="lsl2">default | ||
{ | { | ||
state_entry() | state_entry() | ||
| Line 32: | Line 32: | ||
//Returns "The rounded value of -4.5 is: -4" | //Returns "The rounded value of -4.5 is: -4" | ||
} | } | ||
}</ | }</syntaxhighlight> | ||
|helpers | |helpers | ||
|also_functions={{LSL DefineRow||[[llCeil]]|Rounds the float to an integer towards positive infinity}} | |also_functions={{LSL DefineRow||[[llCeil]]|Rounds the float to an integer towards positive infinity}} | ||
| Line 39: | Line 39: | ||
|also_articles | |also_articles | ||
|also_tests | |also_tests | ||
|notes | |notes=*For positive values, it is quicker to add 0.5 to the value and cast to an integer. i=(integer)(f+0.5) produces less bytecode than i=llRound(f) and is about 5 times faster in execution, while giving the same result. | ||
|permission | |permission | ||
|negative_index | |negative_index | ||
Latest revision as of 11:40, 9 October 2023
| LSL Portal | Functions | Events | Types | Operators | Constants | Flow Control | Script Library | Categorized Library | Tutorials |
Summary
Function: integer llRound( float val );| 0.0 | Forced Delay |
| 10.0 | Energy |
Returns the integer that val is closest to.
| • float | val | – | Any valid float value |
If the absolute value of the tenths position is 4 or less, val is rounded off; otherwise, val is rounded towards positive infinity.
Caveats
- The returned value is -2147483648 (0x80000000) if the arithmetic result is outside of the range of valid integers (-2147483648 to 2147483647 inclusive).
Examples
default
{
state_entry()
{
llSay(0, "The rounded value of -4.9 is: "+(string)llRound(-4.9) );
//Returns "The rounded value of -4.9 is: -5"
llSay(0, "The rounded value of -4.1 is: "+(string)llRound(-4.1) );
//Returns "The rounded value of -4.1 is: -4"
llSay(0, "The rounded value of 4.5 is: "+(string)llRound(4.5) );
//Returns "The rounded value of 4.5 is: 5"
llSay(0, "The rounded value of 4.9 is: "+(string)llRound(4.9) );
//Returns "The rounded value of 4.9 is: 5"
llSay(0, "The rounded value of 4.1 is: "+(string)llRound(4.1) );
//Returns "The rounded value of 4.1 is: 4"
llSay(0, "The rounded value of -4.5 is: "+(string)llRound(-4.5) );
//Returns "The rounded value of -4.5 is: -4"
}
}
Notes
- For positive values, it is quicker to add 0.5 to the value and cast to an integer. i=(integer)(f+0.5) produces less bytecode than i=llRound(f) and is about 5 times faster in execution, while giving the same result.
See Also
Deep Notes
Signature |
|---|
function integer llRound( float val ); |