Write a program to Implement a Queue in C++

User is asked to Insert into.. Delete from or Display the entire queue..

Select To use this code as it is.. select and copy paste this code into code.cpp file :)

1. #include<stdio.h> 
2. #include<conio.h> 
3. #include<process.h> 
4. int queue[5]; 
5. long front,rear; 
6. void initqueue(); 
7. void display(); 
8. void main() 
9. { 
10. int choice,info; 
11. clrscr(); 
12. while(1) 
13. { 
14. clrscr(); 
15. printf(" MENU \n"); 
16. printf("1.Insert an element in queue\n"); 
17. printf("2.Delete an element from queue\n"); 
18. printf("3.Display the queue\n"); 
19. printf("4.Exit!\n"); 
20. printf("Your choice: "); 
21. scanf("%i",&choice); 
22. //Coding by: Snehil Khanor  
23. //http://WapCPP.blogspot.com  
24. switch(choice) 
25. { 
26. case 1:if(rear<4) 
27. { 
28. printf("enter the number: "); 
29. scanf("%d",&info); 
30. if (front==-1) 
31. { 
32. front=0; 
33. rear=0; 
34. } 
35. else 
36. rear=rear+1; 
37. queue[rear]=info; 
38. } 
39. else 
40. printf("queue is full"); 
41. getch(); 
42. break; 
43. case 2: int info; 
44. if(front!=-1) 
45. { 
46. info=queue[front]; 
47. if(front==rear) 
48. { 
49. front=-1; 
50. rear=-1; 
51. } 
52. else 
53. front=front+1; 
54. printf("no deleted is = %d",info); 
55. } 
56. else 
57. printf("queue is empty"); 
58. getch(); 
59. break; 
60. case 3: display(); 
61. getch(); 
62. break; 
63. case 4: exit(1); 
64. break; 
65. default:printf("You entered wrong choice!"); 
66. getch(); 
67. break; 
68. } 
69. } 
70. } 
71. void initqueue() 
72. { 
73. front=rear=-1; 
74. } 
75. void display() 
76. { 
77. int i; 
78. for(i=front;i<=rear;i++) 
79. printf("%i\n",queue[i]); 
80. }