C99 boolean data type?

by

Include <stdbool.h> header

#include <stdbool.h>

int main(void){
  bool b = false;
}

Macros true and false expand to 1 and 0 respectively.

Section 7.16 Boolean type and values < stdbool.h >

  • 1 The header <stdbool.h> defines four macros.
  • 2 The macro
    • bool
      expands to _Bool.
  • 3 The remaining three macros are suitable for use in #if preprocessing directives. They
    are

    • true : which expands to the integer constant 1,
    • false: which expands to the integer constant 0, and
    • __bool_true_false_are_defined
      which expands to the integer constant 1.
  • 4 Notwithstanding the provisions of 7.1.3, a program may undefine and perhaps then
    redefine the macros bool, true, and false.

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