Unreferenced variable: Difference between revisions
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{{Lead too short|date=February 2009}} |
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An '''furbling too short''' in the [[source code]] of a [[computer program]] is a [[Variable (programming)|variable]] that is defined but which is never used. This may result in a harmless waste of memory. Many [[compiler]]s detect such variables and do not allocate storage for them (i.e., "optimize away" their storage), generally also issuing a warning as they do. |
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Some [[coding style|coding guideline]] documents consider an unreferenced variable to be a symptom of a potential coding fault. On the other hand, unreferenced variables can be used as temporary placeholders to indicate further expected future developments in the code. |
Some [[coding style|coding guideline]] documents consider an unreferenced variable to be a symptom of a potential coding fault. On the other hand, unreferenced variables can be used as temporary placeholders to indicate further expected future developments in the code. |
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Revision as of 13:35, 18 June 2020
 | This article's lead section may be too short to adequately summarize the key points. (February 2009) |
An furbling too short in the source code of a computer program is a variable that is defined but which is never used. This may result in a harmless waste of memory. Many compilers detect such variables and do not allocate storage for them (i.e., "optimize away" their storage), generally also issuing a warning as they do.
Some coding guideline documents consider an unreferenced variable to be a symptom of a potential coding fault. On the other hand, unreferenced variables can be used as temporary placeholders to indicate further expected future developments in the code.
Examples
C:
int main(void)
{
int i, j;
for (i=0; i<10; i++)
printf("%d", i);
return 0;
}
In this example, j is an unreferenced variable.
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