Difference between revisions of "For"

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m (revised first example to show full version of 'for' statement including initialiser statement)
m (Replaced old <LSL> block with <source lang="lsl2">)
 
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|spec
 
|spec
 
|caveats
 
|caveats
|examples=<lsl>
+
|examples=<source lang="lsl2">
 
//single statement type.
 
//single statement type.
 
integer a;
 
integer a;
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for(a = 1; a <= b; ++a)
 
for(a = 1; a <= b; ++a)
 
     llOwnerSay((string)a);
 
     llOwnerSay((string)a);
</lsl>
+
</source>
<lsl>
+
<source lang="lsl2">
 
//block statement
 
//block statement
 
integer a = 0;
 
integer a = 0;
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     llOwnerSay((string)a);
 
     llOwnerSay((string)a);
 
}
 
}
</lsl>
+
</source>
<lsl>
+
<source lang="lsl2">
 
//null statement
 
//null statement
 
integer a = 0;
 
integer a = 0;
 
integer b = 10;
 
integer b = 10;
 
for(; a < b; llOwnerSay((string)(a++)));
 
for(; a < b; llOwnerSay((string)(a++)));
</lsl>
+
</source>
 
|helpers
 
|helpers
 
|also_header
 
|also_header
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|also_footer
 
|also_footer
 
|notes=A for loop is the same as a while loop as below.
 
|notes=A for loop is the same as a while loop as below.
<lsl>
+
<source lang="lsl2">
 
initializer;
 
initializer;
 
while(condition)
 
while(condition)
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     increment;
 
     increment;
 
}
 
}
</lsl>
+
</source>
 
|mode
 
|mode
 
|deprecated
 
|deprecated

Latest revision as of 02:05, 22 January 2015

for( initializer; condition; incrementloop

•  initializer Executed once just before checking condition.
•  condition If this executes as true then loop is executed.
•  increment Executed after loop, then condition is checked again.
•  loop Can be either a single statement, a block statement, or a null statement.


Any of the statements can be null statements.

Specification

Conditional Types
Type Condition
integer True if it is not zero.
float True if it is not zero.[1]
string True if its length is not zero.
key True only if it is a valid key and not NULL_KEY.
vector True if the vector is not ZERO_VECTOR.
rotation True if the rotation is not ZERO_ROTATION.
list True if the length is not zero.

Examples

//single statement type.
integer a;
integer b = 10;
for(a = 1; a <= b; ++a)
    llOwnerSay((string)a);
//block statement
integer a = 0;
integer b = 10;
for(; a < b; ++a)
{
    llOwnerSay((string)a);
    llOwnerSay((string)a);
}
//null statement
integer a = 0;
integer b = 10;
for(; a < b; llOwnerSay((string)(a++)));

Notes

A for loop is the same as a while loop as below.

initializer;
while(condition)
{
    loop;
    increment;
}

Deep Notes

Search JIRA for related Issues

Footnotes

  1. ^ The OpenSim LSL compiler will not do this implicitly. You will need to use an explicit check.