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  1. #include <stdio.h>
  2.  
  3. #define SIZE 5
  4. int queue[SIZE];
  5. int head, tail;
  6.  
  7. void enqueue(int value);
  8. int dequeue(void);
  9.  
  10. int main(void)
  11. {
  12.     head = tail = 0; 
  13.     int data, i;
  14.  
  15.     enqueue(1);
  16.     enqueue(2);
  17.     dequeue();
  18.     enqueue(3);
  19.     dequeue();
  20.     enqueue(4);
  21.     enqueue(5);
  22.     dequeue();
  23.     enqueue(6);
  24.  
  25.     for(i = 0; i < SIZE; i++){
  26.         printf("queue[%d] = %d\n", i, queue[i]);
  27.     }
  28.  
  29.     return 0;
  30. }
  31.  
  32. void enqueue(int value)
  33. {
  34.  
  35.     if ((tail + 1) % SIZE == head) {
  36.         printf("Queue is full.\n");
  37.         return;
  38.     }
  39.  
  40.  
  41.     queue[tail] = value;
  42.  
  43.  
  44.     tail = (tail + 1) % SIZE;
  45. }
  46.  
  47. int dequeue(void)
  48. {
  49.     int value;
  50.  
  51.  
  52.     if (head == tail) {
  53.         printf("Queue is empty.\n");
  54.         return -1;
  55.     }
  56.  
  57.     value = queue[head];
  58.  
  59.     queue[head] = 0;
  60.  
  61.  
  62.     head = (head + 1) % SIZE;
  63.  
  64.     return value;
  65. }
Success #stdin #stdout 0.01s 5308KB
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stdin
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Standard input is empty
stdout
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queue[0] = 6
queue[1] = 0
queue[2] = 0
queue[3] = 4
queue[4] = 5
https://ideone.com/xfksio
language:
C (gcc 8.3)
created:
15 days ago
visibility:
public

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