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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. #define QUE_LENGTH 100
  6.  
  7. struct queue{
  8. 	int head;
  9. 	int tail;
  10. 	char *array[QUE_LENGTH];
  11. };
  12.  
  13. struct queue *create_queue(){
  14. 	struct queue* q = (struct queue *)malloc(sizeof(struct queue));
  15. 	q->head = 0;
  16. 	q->tail = 0;
  17. 	return q;
  18. }
  19.  
  20. void enqueue(struct queue *q, char *s){
  21. 	q->array[q->tail] = s;
  22. 	if(q->tail == QUE_LENGTH)
  23. 		q->tail = 0;
  24. 	else
  25. 		q->tail++;
  26. }
  27.  
  28. char *dequeue(struct queue *q){
  29. 	char* s = q->array[q->head];
  30. 	if(q->head == QUE_LENGTH)
  31. 		q->head = 0;
  32. 	else
  33. 		q->head++;
  34. 	return s;
  35. }
  36.  
  37. int main(int argc, char *argv[]){
  38. 	int n = 10;
  39. 	char buffer[100];
  40. 	struct queue *q = create_queue();
  41.  
  42. 	if(argc > 1){
  43. 		++argv;
  44. 		if(**argv == '-')
  45. 			n = atoi(++*argv);
  46. 	}
  47. 	printf("%d\n", n);
  48. 	while(fgets(buffer, 100, stdin)){
  49. 		enqueue(q, buffer);
  50. 	}
  51. 	while(n--){
  52. 		strcpy(buffer, dequeue(q));
  53. 		printf("%s\n", buffer);
  54. 	}
  55. 	return 0;
  56. }
Success #stdin #stdout 0s 2292KB
comments (?)
stdin
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-8
aaa
bbb
ccc
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eee
fff
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stdout
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10
kkk
kkk
kkk
kkk
kkk
kkk
kkk
kkk
kkk
kkk
https://ideone.com/6oLJ94
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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