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  1. #include<stdio.h>
  2. #define SIZE 5
  3. int queue[SIZE];
  4. int head, tail;
  5.  
  6. void enqueue(int value);
  7. int dequeue(void);
  8.  
  9. int main(void)
  10. {
  11.     head = tail = 0; 
  12.     int data, i;
  13.  
  14.     enqueue(1);
  15.     enqueue(2);
  16.     dequeue();
  17.     enqueue(3);
  18.     dequeue();
  19.     enqueue(4);
  20.     enqueue(5);
  21.     dequeue();
  22.     enqueue(6);
  23.  
  24.     for(i=0; i<SIZE; i++){
  25.       printf("queue[%d]=%d\n", i, queue[i] );
  26.     }
  27.  
  28.     return 0;
  29. }
  30.  
  31. void enqueue(int value)
  32. {
  33.     if (head == (tail + 1) % SIZE) {
  34.         printf("Queueは満杯です.\n");
  35.         return;
  36.     }
  37.     queue[tail] = value;
  38.     tail = (tail + 1) % SIZE;
  39. }
  40.  
  41. int dequeue(void)
  42. {
  43.     int value;
  44.     if (head == tail) {
  45.         printf("Queueは空です.\n");
  46.         return -1;
  47.     }
  48.     value = queue[head];
  49.     queue[head] = 0;
  50.     head = (head + 1) % SIZE;
  51.     return value;
  52. }
  53.  
Success #stdin #stdout 0.01s 5276KB
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/WTHgzd
language:
C (gcc 8.3)
created:
12 days ago
visibility:
public

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