The C programming language, as of C99, supports Boolean arithmetic with the built-in type _Bool (see _Bool). When the header <stdbool.h> 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
| Macro name | Expands to |
|---|---|
bool | _Bool |
true | integer constant 1 |
false | integer constant 0 |
__bool_true_false_are_defined | integer constant 1 |
Example
1 2 3 4 5 6 7 8 9 10 | #include <stdio.h>#include <stdbool.h> int main(void){ bool a=true, b=false; printf("%d\n", a&&b); printf("%d\n", a||b); printf("%d\n", !b);} |
Possible output:
1 2 3 | 011 |
See also
C++ documentation for bool |
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