making a queue program
- by seventhief
Hi can someone help me making a queue program. i want to set the array[0] to be array[1] just in display but in real i am adding value at array[0]. i got how to run the add function to it. but i can't do the view and delete command that will view from ex. array[0] to array[4], when displayed array[1] to array[5] with the value inserted.
#include <stdio.h>
#include <stdlib.h>
#define p printf
#define s scanf
int rear = 0;
int front = 0;
int *q_array = NULL;
int size = 0;
main()
{
int num, opt;
char cont[] = { 'y' };
clrscr();
p("Queue Program\n\n");
p("Queue size: ");
s("%d", &size);
p("\n");
if(size > 0)
{
q_array = malloc(size * sizeof(int));
if(q_array == NULL)
{
p("ERROR: malloc() failed\n");
exit(2);
}
}
else
{
p("ERROR: size should be positive integer\n");
exit(1);
}
while((cont[0] == 'y') || (cont[0] == 'Y'))
{
clrscr();
p("Queue Program");
p("\n\nQueue size: %d\n\n", size);
p("MAIN MENU\n1. Add\n2. Delete\n3. View");
p("\n\nYour choice: ");
s("%d", &opt);
p("\n");
switch(opt) {
case 1:
if(rear==size)
{
p("You can't add more data");
}
else
{
p("Enter data for Queue[%d]: ", rear+1);
s("%d", &num);
add(num);
}
break;
case 2:
delt();
break;
case 3:
view();
break;
}
p("\n\nDo you want to continue? (Y\/N)");
s("%s", &cont[0]);
}
}
add(int a)
{
q_array[rear]=a;
rear++;
}
delt()
{
if(front==rear)
{
p("Queue Empty");
}
else
{
p("Queue[%d] = %d removed.", front, q_array[front]);
front++;
}
}
view()
{
int i;
for(i=front;i<=rear;i++)
p("\nQueue[%d] = %d", i, q_array[i]);
}
