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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.    if ( head == (tail+1)%SIZE  ){
  35.         printf("キューは満杯ではいりませんでした\n");
  36.       }else{
  37.              queue[tail++] = value;
  38.       }
  39.       tail = tail % SIZE;
  40. }
  41.  
  42. int dequeue(void)
  43. {
  44.       int value;
  45.       if( head == tail ){
  46.           printf("キューは空で取り出せませんでした\n");
  47.           return 0;
  48.       }else{
  49.              value = queue[head];
  50.       }
  51.       queue[head] = 0;
  52.       head = (head+1) % SIZE;
  53.       return value;
  54. }
  55.  
  56.  
  57.  
  58.  
  59.  
Success #stdin #stdout 0s 5304KB
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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/RnmAuR
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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