C Booleans

Uses integers to represent boolean values.

  1. 0 typically represents false
  2. Any non-zero value represents true

The <stdbool.h> header is used to introduce the boolean type (bool) and the constants true and false.

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

int main() {
    bool isTrue = true;
    bool isFalse = false;

    if (isTrue) {
        printf("This condition is true.\n");
    } else {
        printf("This condition is false.\n");
    }

    if (!isFalse) {
        printf("This condition is also true.\n");
    } else {
        printf("This condition is false.\n");
    }

    return 0;
}

Using operators

Example
#include <stdio.h>

int main() {
    int a = 5, b = 3;

    int isEqual = (a == b); // 0 (false)
    int isNotEqual = (a != b); // 1 (true)

    if (isEqual) {
        printf("The numbers are equal\n");
    } else {
        printf("The numbers are not equal\n");
    }

    if (isNotEqual) {
        printf("The numbers are not equal\n");
    } else {
        printf("The numbers are equal\n");
    }

    return 0;
}

Comparing Varables

Example
#include <stdio.h>

int main() {
    int a = 10, b = 5;
    int result;

    // Comparison: a > b
    result = (a > b);

    if (result) {
        printf("a is greater than b\n");
    } else {
        printf("a is not greater than b\n");
    }

    // Comparison: a == b
    result = (a == b);

    if (result) {
        printf("a is equal to b\n");
    } else {
        printf("a is not equal to b\n");
    }

    return 0;
}

Quick Recap - Topics Covered

C Booleans
Using Operators

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