C Boolean

Booleans are a data type in programming languages that can only store true or false values. The C programming language does not have a built-in boolean data type, but it has a standard library that defines a macro to represent boolean values.

Syntax

In C, true and false are represented as 1 and 0, respectively. The header stdbool.h provides a set of macros that can be used to represent boolean values in C. The bool type is defined in this header file along with two constants: true and false.

#include <stdbool.h>

bool variable_name;

Example

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

int main() {
   bool isHealthy = true;
   bool isTall = false;

   if (isHealthy && isTall) {
      printf("You are a healthy and tall person.\n");
   } else if (isHealthy && !isTall) {
      printf("You are a healthy but not tall person.\n");
   } else {
      printf("You are not a healthy person.\n");
   }

   return 0;
}

Output

You are a healthy but not tall person.

Explanation

The code example above declares two bool variables isHealthy and isTall. The first if statement checks if both variables are true. If both variables are true, the program prints "You are a healthy and tall person." Otherwise, it checks whether isHealthy is true and isTall is false. If the condition is true, the program prints "You are a healthy but not tall person." If both isHealthy and isTall are false, the program prints "You are not a healthy person."

Use

Boolean variables are useful for making decisions based on whether a condition is true or false. They can be used in conditional statements (if, else if, else), loops, and functions.

Important Points

• C does not have a built-in boolean data type, but the stdbool.h header file provides a way to represent boolean values in C using the bool, true, and false macros.
• In C, true is represented by the integer value 1, and false is represented by the integer value 0.
• Boolean variables are used for making decisions based on whether a condition is true or false.

Summary

In C, boolean data types are represented using bool, true, and false macros defined in the stdbool.h header file. Boolean variables are essential for decision-making based on whether a condition is true or false, and they have a wide range of uses in C programs. Understanding how to use boolean data types in C is essential for efficient and effective programming.