# stdbool

***

**1. Checking for Boolean Values:**

```c
#include <stdbool.h>

int main() {
  bool is_true = true;
  if (is_true) {
    printf("True\n");
  } else {
    printf("False\n");
  }
  return 0;
}
```

**2. Using Boolean Variables in Conditional Statements:**

```c
#include <stdbool.h>

int main() {
  bool condition = false;
  int value = condition ? 10 : 0;
  printf("Value: %d\n", value);
  return 0;
}
```

**3. Negating Boolean Variables:**

```c
#include <stdbool.h>

int main() {
  bool is_enabled = true;
  bool is_disabled = !is_enabled;
  printf("Is enabled: %d\n", is_enabled);
  printf("Is disabled: %d\n", is_disabled);
  return 0;
}
```

**4. Using Boolean Arrays:**

```c
#include <stdbool.h>

int main() {
  bool flags[5] = {true, false, true, false, true};
  for (int i = 0; i < 5; i++) {
    printf("Flag %d: %d\n", i, flags[i]);
  }
  return 0;
}
```

**5. Returning Boolean Values from Functions:**

```c
#include <stdbool.h>

bool is_valid(int number) {
  return number >= 0;
}

int main() {
  int number = 10;
  bool is_valid_number = is_valid(number);
  printf("Is valid: %d\n", is_valid_number);
  return 0;
}
```

**6. Using Boolean Variables in Structures:**

```c
#include <stdbool.h>

typedef struct {
  bool is_male;
  int age;
  char* name;
} Person;

int main() {
  Person person = {true, 25, "John Doe"};
  printf("Is male: %d\n", person.is_male);
  return 0;
}
```

**7. Using Boolean Constants:**

```c
#include <stdbool.h>

int main() {
  const bool FALSE = 0;
  const bool TRUE = 1;
  if (FALSE) {
    printf("False\n");
  } else {
    printf("True\n");
  }
  return 0;
}
```

**8. Logical Operations with Boolean Variables:**

```c
#include <stdbool.h>

int main() {
  bool a = true, b = false;
  bool result = a && b; // Logical AND
  result = a || b; // Logical OR
  result = !a; // Logical NOT
  printf("Result: %d\n", result);
  return 0;
}
```

**9. Bitwise Operations with Boolean Variables:**

```c
#include <stdbool.h>

int main() {
  bool a = true, b = false;
  bool result = a & b; // Bitwise AND
  result = a | b; // Bitwise OR
  result = ~a; // Bitwise NOT
  printf("Result: %d\n", result);
  return 0;
}
```

**10. Using Boolean Variables in Switch Cases:**

```c
#include <stdbool.h>

int main() {
  bool is_raining = true;
  switch (is_raining) {
    case true:
      printf("It's raining\n");
      break;
    case false:
      printf("It's not raining\n");
      break;
  }
  return 0;
}
```

**11. Using Boolean Variables in Loops:**

```c
#include <stdbool.h>

int main() {
  bool should_continue = true;
  while (should_continue) {
    printf("Looping...\n");
    should_continue = false; // Stop the loop
  }
  return 0;
}
```

**12. Using Boolean Variables in Macros:**

```c
#include <stdbool.h>

#define IS_ODD(number) ((number % 2) == 1)

int main() {
  int number = 5;
  if (IS_ODD(number)) {
    printf("Number is odd\n");
  } else {
    printf("Number is even\n");
  }
  return 0;
}
```

**13. Using Boolean Variables for Error Handling:**

```c
#include <stdbool.h>

bool check_error(int status) {
  return status != 0;
}

int main() {
  int status = -1;
  bool error_occurred = check_error(status);
  if (error_occurred) {
    printf("Error occurred\n");
  } else {
    printf("No error occurred\n");
  }
  return 0;
}
```

**14. Using Boolean Variables for Flags:**

```c
#include <stdbool.h>

bool is_initialized = false;

int main() {
  if (!is_initialized) {
    // Initialize something
    is_initialized = true;
  }
  return 0;
}
```

**15. Using Boolean Variables for Conditional Compilation:**

```c
#include <stdbool.h>

#ifdef DEBUG
bool is_debug_mode = true;
#else
bool is_debug_mode = false;
#endif

int main() {
  if (is_debug_mode) {
    // Perform debug operations
  }
  return 0;
}
```

**16. Using Boolean Variables for State Machines:**

```c
#include <stdbool.h>

enum State {
  ACTIVE,
  INACTIVE
};

State current_state = ACTIVE;

int main() {
  while (true) {
    switch (current_state) {
      case ACTIVE:
        // Perform active state operations
        current_state = INACTIVE;
        break;
      case INACTIVE:
        // Perform inactive state operations
        current_state = ACTIVE;
        break;
    }
  }
  return 0;
}
```

**17. Using Boolean Variables for Binary Search Trees:**

```c
#include <stdbool.h>

typedef struct Node {
  int data;
  bool left_present;
  bool right_present;
  struct Node* left_child;
  struct Node* right_child;
} Node;

Node* insert_node(...) {
  // ...
  // If left child is present
  if (node->left_present) {
    insert_node(...)
  }
  // ...
  // If right child is present
  if (node->right_present) {
    insert_node(...)
  }
  // ...
}
```

**18. Using Boolean Variables for Bit Manipulation:**

```c
#include <stdbool.h>

bool get_bit(int number, int position) {
  return (number & (1 << position)) != 0;
}

int main() {
  int number = 0b10110;
  bool bit_value = get_bit(number, 2);
  printf("Bit value: %d\n", bit_value);
  return 0;
}
```

**19. Using Boolean Variables for Set Operations:**

```c
#include <stdbool.h>

typedef struct Set {
  bool members[100];
  int size;
} Set;

bool set_contains(Set* set, int element) {
  return set->members[element] == true;
}

int main() {
  Set set = {{}};
  set.members[5] = true;
  bool is_present = set_contains(&set, 5);
  printf("Element present: %d\n", is_present);
  return 0;
}
```

**20. Using Boolean Variables for Graph Representations:**

```c
#include <stdbool.h>

typedef struct Graph {
  bool adjacency_matrix[100][100];
  int num_vertices;
} Graph;

void add_edge(Graph* graph, int vertex1, int vertex2) {
  graph->adjacency_matrix[vertex1][vertex2] = true;
}

int main() {
  Graph graph = {{}};
  add_edge(&graph, 0, 1);
  printf("Edge added\n");
  return 0;
}
```

**21. Using Boolean Variables for Game States:**

```c
#include <stdbool.h>

typedef struct Game {
  bool is_game_over;
  int player_score;
} Game;

void update_game(Game* game) {
  // ...
  // If game is over
  if(...) {
    game->is_game_over = true;
  }
  // ...
}

int main() {
  Game game = {false, 0};
  update_game(&game);
  printf("Game over: %d\n", game.is_game_over);
  return 0;
}
```

**22. Using Boolean Variables for Array Sorting:**

```c
#include <stdbool.h>

void swap(int* a, int* b) {
  int temp = *a;
  *a = *b;
  *b = temp;
}

void bubble_sort(int* array, int size) {
  bool swapped = true;
  while (swapped) {
    swapped = false;
    for (int i = 0; i < size - 1; i++) {
      if (array[i] > array[i + 1]) {
        swap(&array[i], &array[i + 1]);
        swapped = true;
      }
    }
  }
}

int main() {
  int array[] = {5, 2, 8, 1, 7};
  int size = 5;
  bubble_sort(array, size);
  printf("Sorted array: ");
  for (int i = 0; i < size; i++) {
    printf("%d ", array[i]);
  }
  printf("\n");
  return 0;
}
```

**23. Using Boolean Variables for Text Justification:**

```c
#include <stdbool.h>

void justify_text(char* text, int width) {
  int current_length = 0;
  bool is_last_line = false;
  for (int i = 0; i < strlen(text); i++) {
    if (text[i] == '\n') {
      current_length = 0;
      continue;
    }
    if (current_length + 1 > width) {
      if (is_last_line) {
        // Add extra spaces to the current line
        int spaces_to_add = width - current_length;
        for (int j = 0; j < spaces_to_add; j++) {
          text[i - 1 + j] = ' ';
        }
        current_length += spaces_to_add;
      } else {
        // Start a new line
        text[i] = '\n';
        current_length = 0;
        is_last_line = true;
      }
    } else {
      current_length++;
    }
  }
}

int main() {
  char text[] = "This is a sample text that I will use to demonstrate the text justification algorithm.";
  int width = 20;
  justify_text(text, width);
  printf("Justified text:\n%s", text);
  return 0;
}
```

**24. Using Boolean Variables for Image Processing:**

```c
#include <stdbool.h>

bool apply_filter(int* pixels, int width, int height) {
  bool is_successful = true;
  for (int i = 0; i < width * height; i++) {
    // Apply filter to pixel
    int new_pixel_value = pixels[i];
    if (new_pixel_value < 0 || new_pixel_value > 255) {
      is_successful = false;
      break;
    }
    pixels[i] = new_pixel_value;
  }
  return is_successful;
}

int main() {
  // Load image into pixels array
  int pixels[] = {...};
  int width = 100, height = 100;
  bool is_successful = apply_filter(pixels, width, height);
  if (is_successful) {
    // Save filtered image
  } else {
    // Handle error
  }
  return 0;
}
```

**25. Using Boolean Variables for Queue Implementations:**

```c
#include <stdbool.h>

typedef struct Queue {
  int* data;
  int front;
  int rear;
  int size;
  bool is_empty;
  bool is_full;
} Queue;

void enqueue(Queue* queue, int element) {
  if (!queue->is_full) {
    queue->data[queue->rear] = element;
    queue->rear = (queue->rear + 1) % queue->size;
    if (queue->front == queue->rear) {
      queue->is_full = true;
    }
  }
}

int main() {
  Queue queue = {malloc(100 * sizeof(int)), 0, 0, 100, true, false};
  enqueue(&queue, 10);
  printf("First element: %d\n", queue.data[queue.front]);
  return 0;
}
```

**26. Using Boolean Variables for Stack Implementations:**

```c
#include <stdbool.h>

typedef struct Stack {
  int* data;
  int top;
  int size;
  bool is_empty;
  bool is_full;
} Stack;

void push(Stack* stack, int element) {
  if (!stack->is_full) {
    stack->data[stack->top] = element;
    stack->top++;
    if (stack->top == stack->size) {
      stack->is_full = true;
    }
  }
}

int main() {
  Stack stack = {malloc(100 * sizeof(int)), 0, 100, true, false};
  push(&stack, 10);
  printf("Top element: %d\n", stack.data[stack->top - 1]);
  return 0;
}
```

**27. Using Boolean Variables for Singly Linked Lists:**

```c
#include <stdbool.h>

typedef struct Node {
  int data;
  struct Node* next;
  bool is_last;
} Node;

void insert_node(Node* head, int element) {
  Node* new_node = malloc(sizeof(Node));
  new_node->data = element;
  new_node->next = NULL;
  if (

```