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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 = 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. 	char *t = malloc(100);
  22. 	strcpy(t, s);
  23. 	q->array[q->tail] = t;
  24. 	if(q->tail == QUE_LENGTH)
  25. 		q->tail = 0;
  26. 	else
  27. 		q->tail++;
  28. }
  29.  
  30. void dequeue(struct queue *q, char *buffer){
  31. 	strcpy(buffer, q->array[q->head]);
  32. 	free(q->array[q->head]);
  33. 	if(q->head == QUE_LENGTH)
  34. 		q->head = 0;
  35. 	else
  36. 		q->head++;
  37. }
  38.  
  39. int main(int argc, char *argv[]){
  40. 	int n = 10;
  41. 	char buffer[100];
  42. 	struct queue *q = create_queue();
  43.  
  44. 	if(argc > 1){
  45. 		++argv;
  46. 		if(**argv == '-')
  47. 			n = atoi(++*argv);
  48. 	}
  49. 	printf("%d\n", n);
  50. 	while(fgets(buffer, 100, stdin)){
  51. 		enqueue(q, buffer);
  52. 	}
  53. 	while(n--){
  54. 		dequeue(q, buffer);
  55. 		printf("%s", buffer);
  56. 	}
  57. 	return 0;
  58. }
Success #stdin #stdout 0s 2292KB
comments (?)
stdin
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-8
aaa
bbb
ccc
ddd
eee
fff
ggg
hhh
iii
jjj
kkk
stdout
copy 
10
-8
aaa
bbb
ccc
ddd
eee
fff
ggg
hhh
iii
https://ideone.com/VlIRVw
language:
C (gcc 8.3)
created:
8 years ago
visibility:
public

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