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  1. #include <stdio.h>
  2. #define SIZE 5
  3.  
  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=0;
  13. 	tail=0;
  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(int i=0;i<SIZE;i++){
  26. 		printf("queue[%d]=%d\n",i,queue[i]);
  27. 	}
  28. 	return 0;
  29. }
  30.  
  31. void enqueue(int value){
  32. 	if(head==(tail+1)%SIZE){
  33. 		printf("キューは満杯で入りませんでした\n");
  34. 	}
  35. 	else{
  36. 		queue[tail]=value;
  37. 		tail++;
  38. 	}
  39. 	tail=tail%SIZE;
  40. }
  41.  
  42. int dequeue(void){
  43. 	int value;
  44. 	if(head==tail){
  45. 		printf("キューは空で取り出せませんでした\n");
  46. 	return 0;
  47. 	}
  48. 	else{
  49. 		value=queue[head];
  50. 		queue[head]=0;
  51. 		head++;
  52. 	}
  53. 	head=head%SIZE;
  54. 	return value;
  55. }
Success #stdin #stdout 0s 5320KB
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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/jWfvdB
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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