JavaScript provides a Boolean data type with and literals.
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In Lua, there is a boolean data type, but non-boolean value can also behave as boolean.
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Objective-C also has a separate Boolean data type BOOL, with possible values being YES or NO, equivalents of true and false respectively.
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Languages without an explicit Boolean data type, like word, rather than a bit; this is usually due to the ways computers transfer blocks of information.
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Alternatively, the entire system of boolean data types could be specified using a different set of constructor functions : a " false " constructor and a " not " constructor.
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In programming languages that include a distinct boolean data type in their type system, like C, relational operators return the integers 0 or 1, where 0 stands for false and any non-zero value stands for true.
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C + + has a separate Boolean data type bool, but with automatic conversions from scalar and pointer values that are very similar to those of C . This approach was adopted also by many later languages, especially by some scripting ones such as AWK.
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In SQL, which uses a three-valued logic for explicit comparisons because of its special treatment of Nulls, the Boolean data type ( introduced in SQL : 1999 ) is also defined to include more than two truth values, so that SQL " Booleans " can store all logical values resulting from the evaluation of predicates in SQL . A column of Boolean type can also be restricted to just TRUE and FALSE though.
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