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  1. #include<stdio.h> 
  2. #define SIZE 5 
  3. int queue[SIZE]; 
  4. int head, tail; 
  5. void enqueue(int value); 
  6. int dequeue(void); 
  7. int main(void) 
  8. { 
  9.  head = tail = 0; //初期化
  10.  int data, i; 
  11.  enqueue(1); 
  12.  enqueue(2); 
  13.  dequeue(); 
  14.  enqueue(3); 
  15.  dequeue(); 
  16.  enqueue(4); 
  17.  enqueue(5); 
  18.  dequeue(); 
  19.  for(i=0; i<SIZE; i++){ 
  20.  printf("queue[%d]=%d\n", i, queue[i] ); 
  21.  } 
  22.  return 0; 
  23. } 
  24. void enqueue(int value) 
  25. { 
  26.  if( head == (tail+1)%SIZE ){ 
  27.  printf("キューは満杯で入りませんでした¥n"); 
  28.  }else{ 
  29.  queue[tail] = value; 
  30.  tail = tail + 1; 
  31.  } 
  32.  tail = tail % SIZE; 
  33. } 
  34. int dequeue(void) 
  35. { 
  36.  int value; 
  37.  if( head == tail ){ 
  38.  printf("キューは空で取り出せませんでした¥n"); 
  39.  return 0; 
  40.  }else{ 
  41.  value = queue[head]; 
  42.  queue[head] = 0; //抽出後に 0 を代入
  43.  head = head + 1; 
  44.  } 
  45.  head = head % SIZE; 
  46.  return value; 
  47. }
  48.  
Success #stdin #stdout 0s 5284KB
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stdin
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Standard input is empty
stdout
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queue[0]=0
queue[1]=0
queue[2]=0
queue[3]=4
queue[4]=5
https://ideone.com/17VQCP
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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