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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #define QUEUE_SIZE 100
  4.  
  5. typedef int element;
  6. element queue[QUEUE_SIZE];  // 큐 배열 선언
  7. int front = -1, rear = -1;  // front와 rear 초기화
  8.  
  9. int isEmpty() {
  10.     return front == rear;
  11. }
  12.  
  13. int isFull() {
  14.     return rear == QUEUE_SIZE - 1;
  15. }
  16.  
  17. void enqueue(element item) {
  18.     if (isFull()) {
  19.         printf("\nQueue is Full!\n");
  20.         return;
  21.     }
  22.     queue[++rear] = item;
  23. }
  24.  
  25. element dequeue() {
  26.     if (isEmpty()) {
  27.         printf("\nQueue is Empty!\n");
  28.         return -1;
  29.     }
  30.     return queue[++front];
  31. }
  32.  
  33. element peek() {
  34.     if (isEmpty()) {
  35.         printf("\nQueue is Empty!\n");
  36.         exit(1);
  37.     }
  38.     return queue[front + 1];
  39. }
  40.  
  41. void printQueue() {
  42.     if (isEmpty()) {
  43.         printf("\nQueue is Empty!\n");
  44.         return;
  45.     }
  46.     printf("\nQueue [ ");
  47.     for (int i = front + 1; i <= rear; i++) {
  48.         printf("%d ", queue[i]);
  49.     }
  50.     printf("]\n");
  51. }
  52.  
  53. int main(void) {
  54.     element item;
  55.  
  56.     printf("큐 연산\n");
  57.     printQueue();
  58.  
  59.     enqueue(10); printQueue();
  60.     enqueue(20); printQueue();
  61.     enqueue(30); printQueue();
  62.  
  63.     item = peek();
  64.     printf("peek => %d\n", item);
  65.  
  66.     item = dequeue();
  67.     printQueue();
  68.     printf("\tdequeue => %d\n", item);
  69.  
  70.     item = dequeue();
  71.     printQueue();
  72.     printf("\tdequeue => %d\n", item);
  73.  
  74.     item = dequeue();
  75.     printQueue();
  76.     printf("\tdequeue => %d\n", item);
  77.  
  78.     return 0;
  79. }
  80.  
Success #stdin #stdout 0s 5284KB
comments (?)
stdin 
Standard input is empty
stdout 
큐 연산

Queue is Empty!

Queue [ 10 ]

Queue [ 10 20 ]

Queue [ 10 20 30 ]
peek => 10

Queue [ 20 30 ]
	dequeue => 10

Queue [ 30 ]
	dequeue => 20

Queue is Empty!
	dequeue => 30
https://ideone.com/ZSgBV3
language:
C (gcc 8.3)
created:
279 days ago
visibility:
public

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