Difference between revisions of "Return"
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Omei Qunhua (talk | contribs) (Supplied a more sensible example) |
Omei Qunhua (talk | contribs) (typos) |
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integer Calc (string cmd, integer a, integer b) | integer Calc (string cmd, integer a, integer b) | ||
{ | { | ||
// The user function | // The user function has been declared as returning an integer, | ||
// so every return within the function must return an integer | // so every return within the function must return an integer | ||
if (cmd == "+") return a + b; | if (cmd == "+") return a + b; | ||
| Line 45: | Line 45: | ||
if (cmd == "*") return a * b; | if (cmd == "*") return a * b; | ||
if (cmd == "/") return a / b; | if (cmd == "/") return a / b; | ||
// We must return a value here | // We must return a value here too, we can't omit the final return | ||
return -1; | return -1; | ||
} | } | ||
Revision as of 03:06, 29 December 2012
| LSL Portal | Functions | Events | Types | Operators | Constants | Flow Control | Script Library | Categorized Library | Tutorials |
- The correct title of this article is return. The initial letter is shown capitalized due to technical restrictions.
return value;
return value;| • type | value | – | value or variable to be returned by the function, the type must be the same as that to be returned by the function. |
Used to return execution to the previous scope along with a value.
Functions
- Exits the function and continues script execution in the previous scope.
Events
- Causes the script to crash. Events cannot return a value. Use the next form of this keyword instead.
return;
Used to prematurely return execution to the previous scope before reaching the end of the function/event. You do not need to use this at the end of an event or function, as it is assumed by the compiler.
Functions
- Exits the function and continues script execution in the previous scope.
Events
- Exits the event and removes it from the event queue. If there is another event in the queue, that event is triggered.
Caveats
- There is a bug in the compiler and it will let you return a value with events, which when encountered at runtime will cause the script to crash.
- Do not try to return a value in the event scope if you do not wish your script to crash.
Examples
<lsl>integer Goodbye() {
llOwnerSay("Goodbye");
return 0;
}
Hello() {
llOwnerSay("Hello");
return;
}</lsl> <lsl> integer Calc (string cmd, integer a, integer b) {
// The user function has been declared as returning an integer, // so every return within the function must return an integer if (cmd == "+") return a + b; // We don't need to code 'else' here, as the preceding statement resulted in 'return' when true if (cmd == "-") return a - b; if (cmd == "*") return a * b; if (cmd == "/") return a / b; // We must return a value here too, we can't omit the final return return -1;
} default {
state_entry()
{
llSay(0, llList2CSV ( [ Calc("+",1,2), Calc ("-",5,3), Calc ("*",3,4), Calc("/",18,6) ] ) );
}
} </lsl>