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QUESTION
(a) Give the representation of a queue as an abstract data type.
(b) What is a priority queue? Give two types of priority queues.
(c) The following program does the following:
1. Create a queue, q, consisting of 1 (front), 2, 3, 4 and 5 (rear).
2. Display the contents of q.
3. Remove an item from q and display the content of q.
#include
#define MAXQUEUE 6
#define TRUE 1
#define FALSE 0
struct queue
{
int items[MAXQUEUE];
int front, rear;
};
void initialize();
int empty();
void insert();
int rem();
void output();
int n;
void main()
struct queue q;
int i,E;
initialize(&q);
printf("Enter the number of elements: ");
scanf("%d",&n);
If (n { for(i=0;i { printf("Enter an element: "); scanf("%d",&E); insert(&q,E); } } else { printf("Number of elements must be less than MAXQUEUE.\n"); return; } printf("\nContent of the Queue from Front to Rear: "); output(&q); rem(&q); printf("\nContent of the Queue from Front to Rear: "); output(&q); } Write the functions initialize, empty, insert and rem in C.
for(i=0;i { printf("Enter an element: "); scanf("%d",&E); insert(&q,E); } } else { printf("Number of elements must be less than MAXQUEUE.\n"); return; } printf("\nContent of the Queue from Front to Rear: "); output(&q); rem(&q); printf("\nContent of the Queue from Front to Rear: "); output(&q); } Write the functions initialize, empty, insert and rem in C.
printf("Enter an element: ");
scanf("%d",&E);
insert(&q,E);
}
else
printf("Number of elements must be less than MAXQUEUE.\n");
return;
printf("\nContent of the Queue from Front to Rear: ");
output(&q);
rem(&q);
Write the functions initialize, empty, insert and rem in C.
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3. Discuss the objectives of Query Processing.
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