BOOLEAN DATA TYPE IN C AND C++

A boolean is a data type in the C Standard Library which can store true or false. Every non-zero value corresponds to true while 0 corresponds to false.

The boolean works as it does in C++. However, if you don’t include the header file​ stdbool.h, the program will not compile.

Another option is to define our own data type using typedef, which takes the values true and false:

 typedef enum {false, true} bool;

However, it is safer to rely on the standard boolean in stdbool.h. 

 

Examples

1. Using the header file stdbool.h

 

include <stdio.h>

#include <stdbool.h>

int main() {

  bool x = false;

  if(x){

    printf("x is true.");

  }

  else{

    printf("x is false.");

  }

}

       

 

 USING TYPEDEF

 

 

 

#include <stdio.h>

typedef enum {false, true} bool;

int main() {

  bool x = false;

  if(x){

    printf("x is true.");

  }

  else{

    printf("x is false.");

  }

}

 

 

#include <stdio.h> #include <stdbool.h> int main() { bool x = false; if(x){ printf("x is true."); } else{ printf("x is false."); } }