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sentinel value
Last modified: Monday, August 02, 2004 

(sen´t&-n&l; val´ū) (n.) In programming, a special value that is used to terminate a loop. The sentinel value typically is chosen so as to not be a legitimate data value that the loop will encounter and attempt to perform with. For example, in a loop algorithm that computes non-negative integers, the value “-1” can be set as the sentinel value as the computation will never encounter that value as a legitimate processing output.

Also referred to as a flag value or a signal value.

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