Predefined Boolean constants (since C23)

Syntax

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 <stdbool.h>. An implementation may also define bool, true, and false

Example

#include <assert.h>
 
int main()
{
    assert(true == 1 && 0 == false);
}

References

See also