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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. struct part {
  5.     int value;
  6. 	struct part* next;
  7. };
  8.  
  9. struct part* tail;
  10. int count;
  11.  
  12. void initialze() {
  13. 	tail = NULL;
  14. 	count = 0;
  15. }
  16.  
  17. void enterq(int val) {
  18. 	struct part* p;
  19. 	p = malloc(sizeof(struct part));
  20. 	p->value = val;
  21. 	if (tail == NULL) {
  22. 		tail = p;
  23. 		tail->next = p;
  24. 	} else {
  25. 		p->next = tail->next;
  26. 		tail->next = p;
  27. 		tail = p;
  28. 	}
  29. 	count++;
  30. }
  31.  
  32. int removeq(void) {
  33. 	int val;
  34. 	struct part* p;
  35. 	if (tail == NULL) {
  36. 		printf("Queue empty\n");
  37. 		return -1;
  38. 	} else {
  39. 		p = tail->next;
  40. 		if (p == tail) {
  41. 			tail = NULL;
  42. 		} else {
  43. 			tail->next = p->next;
  44. 		}
  45. 		val = p->value;
  46. 		free(p);
  47. 		count--;
  48. 		return val;
  49. 	}
  50. }
  51.  
  52. void display() {
  53. 	struct part* p;
  54. 	p = tail;
  55. 	if (p != NULL) {
  56. 		do {
  57. 			p = p->next;
  58. 			printf("\n%d\n", p->value);
  59. 		} while (p != tail);
  60. 	}
  61. }
  62.  
  63. int main(void) {
  64. 	int mode, id;
  65. 	initialze();
  66. 	mode = 1;
  67. 	while (mode) {
  68. 		printf("queue process ? enter(1) or  remove(0) =");
  69. 		scanf("%d", &mode);
  70. 		if (mode == 1) {
  71. 			printf("? id = ");
  72. 			scanf("%d", &id);
  73. 			enterq(id);
  74. 		} else if (mode == 0) {
  75. 			id = removeq();
  76. 			if (id > 0)
  77. 				printf("id = %d was removed\n", id);
  78. 		}
  79. 		display();
  80. 		printf("?continue(1) or quit(0) = ");
  81. 		scanf("%d", &mode);
  82. 	}
  83. 	return 0;
  84. }
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https://ideone.com/CgQbhw
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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