format bool c

#include <stdbool.h>
#include <stdio.h>

int main() {
   bool b1 = true;
   bool b2 = false;

   printf("b1: %d\n", b1);
   printf("b2: %d\n", b2);

   return 0;
}

This is a simple example of how to use the bool data type in C. The bool type is defined in the stdbool.h header file and can hold either true or false values. In this example, we declare two bool variables b1 and b2, initialize them with true and false values respectively, and then print their values using the %d format specifier in the printf function. The output will be 1 for true and 0 for false.