Boolean values: Difference between revisions

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=={{header|FutureBasic}}==

FB recognizes two types for boolean truth values: BOOL and boolean. There is a subtle difference between the two. A BOOL will accept without complaint ~~two values,~~ the macros YES, and NO, or the equivalent native FB constants, _true, and _false. However, although a BOOL can be assigned other values, it will throw a clang (FB"s native compiler) warning as with this example:

FB recognizes two types for boolean truth values: BOOL and boolean. There is a subtle difference between the two. A BOOL will accept without complaint the macros YES, and NO, the equivalent native FB constants, _true, and _false, and, of course, 0 and 1. However, although a BOOL can be assigned other values, it will throw a clang (FB"s native compiler) warning as with this example:

window 1

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implicit conversion from constant value -1 to 'BOOL'; the only well defined values for 'BOOL' are YES and NO [-Wobjc-bool-constant-conversion]

</syntaxhighlight>

On the other hand, a Boolean can be assigned not only YES, NO, _true, or _false, but also ~~any integer~~ ~~value~~, such as the common -1, an compile without complaint.

On the other hand, a Boolean can be assigned not only YES, NO, _true, or _false, and 0 or 1, but also other values, such as the common -1, and compile without complaint.

Since FB can also work with objects, native BOOLs and booleans need to be converted to objects as demonstrated in the code below.

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booleanObject variable reassigned as N0 == 0

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=={{header|Gambas}}==