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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 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. void enqueue(int value)
  32. {
  33.  
  34.     if ((tail + 1) % SIZE == head) {
  35.         return;    
  36.     }
  37.     queue[tail] = value;  
  38.     tail = (tail + 1) % SIZE;   
  39. }
  40.  
  41. int dequeue(void)
  42. {
  43.     if (head == tail) {
  44.         return -1;  
  45.     }
  46.     int value = queue[head];
  47.     queue[head] = 0;   
  48.     head = (head + 1) % SIZE;
  49.  
  50.     return value;
  51. }
Success #stdin #stdout 0s 5320KB
comments (?)
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/Ze6AWj
language:
C (gcc 8.3)
created:
12 days ago
visibility:
public

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