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Explanation The Boolean literals are the keywords true and false. They are prvalues of type bool.

For the built-in logical OR operator, the result is true if either the first or the second operand (or both) is true. This operator is short-circuiting: if the first operand is true, the second operand is not evaluated. Note that bitwise logic operators do not perform short-circuiting.

The C programming language, as of C99, supports Boolean arithmetic with the built-in type _Bool (see _Bool). When the header is included, the Boolean type is also accessible as bool. Standard logical operators &&, ||, ! can be used with the Boolean type in any combination. A program may undefine and perhaps then redefine the macros bool, true and false. Macros Explanation Keywords true and false represent predefined constants. They are non-lvalues of type bool. Notes See integral conversions for implicit conversions from bool to other types and boolean conversions for the implicit conversions from other types to bool. Until C23, true and false were implemented as macros provided in . An implementation may also define bool, true, and false ...

floating constants are values of type float, double, or longdouble predefined constants true / false are values of type bool predefined constant nullptr is a value of type nullptr_t (since C23)

Value categories Evaluation order and sequencing Constants and literals Integer constants Floating constants Character constants true / false(C23) nullptr(C23) String literals Compound literals (C99) Constant expressions Implicit conversions Operators Member access and indirection Logical - Comparison Arithmetic - Assignment Increment and ...