bool in C language

For long time I was under an impression that bool data type is present only in C++ and not in C language. I just got to know that it is there in C however it is not enabled default. So, we have to include it. It is very surprising that it is present there from C99 standard.

#include <stdio.h>
#include <stdbool.h>
int main(){
  bool a = true;
  printf("what's a? %d", a);
  return 0;
}

Note

• Uninitialized bool defaults to false.
• There is no format specifier in printf to specify bool type.

References

• Wikibooks
• SO