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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. void enqueue(int value)
  11. {
  12.     if (head == (tail + 1) % SIZE) {
  13.         printf("満杯です\n");
  14.     } else {
  15.         queue[tail] = value;
  16.         tail = (tail + 1) % SIZE;
  17.     }
  18. }
  19.  
  20. int dequeue(void)
  21. {
  22.     int value;
  23.     if (head == tail) {
  24.         printf("空です\n");
  25.         return -1;
  26.     } else {
  27.         value = queue[head];
  28.         queue[head] = 0;
  29.         head = (head + 1) % SIZE;
  30.         return value;
  31.     }
  32. }
  33.  
  34. int main(void)
  35. {
  36.     head = tail = 0;
  37.     int data, i;
  38.  
  39.     enqueue(1);
  40.     enqueue(2);
  41.     dequeue();
  42.     enqueue(3);
  43.     dequeue();
  44.     enqueue(4);
  45.     enqueue(5);
  46.     dequeue();
  47.     enqueue(6);
  48.  
  49.     for (i = 0; i < SIZE; i++) {
  50.         printf("queue[%d] = %d\n", i, queue[i]);
  51.     }
  52.  
  53.     return 0;
  54. }
Success #stdin #stdout 0s 5260KB
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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/3eKMM3
language:
C (gcc 8.3)
created:
16 days ago
visibility:
public

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