C Program to Implement the multiple priority queue.

Data structures using C,Priority QUEUE is a abstract data type in which the objects are inserted with respect to certain priority. In this program, we created the simple multiple priority queue. Read more about C Programming Language .

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#include<stdio.h>
#include<stdlib.h>
#define MAX 3
struct myqueue {
int f, r;
int a[MAX];
};
typedef struct myqueue pqueue;
void insert(pqueue *);
void delete(pqueue *);
void display(pqueue *, pqueue *, pqueue *);
int isempty(pqueue *);
int isfull(pqueue *);

main() {
pqueue q[3];
int ch, i, n;
for (i = 0; i < 3; i++) {
q[i].f = 0;
q[i].r = -1;
}
while (1) {
printf("n******* MENU ********n");
printf("1.Insertn2.Deleten3.Displayn4.Exit");
printf("nEnter your choice:n");
scanf("%d", &ch);
switch (ch) {
case 1:
printf("nEnter priority:n");
scanf("%d", &n);
insert(&q[n - 1]);
break;

case 2:
if (isempty(&q[0])) {
if (isempty(&q[1])) {
if (isempty(&q[2])) {
printf("nAll queues are empty..n");
break;
} else
n = 2;
} else
n = 1;
} else
n = 0;
delete(&q[n]);
break;

case 3:
display(&q[0], &q[1], &q[2]);
break;
case 4:
exit(0);
default:
printf("nInvalid choice..");
break;
}
}
}

int isempty(pqueue *q) {
if (q->f > q->r)
return 1;
else
return 0;
}

int isfull(pqueue *q) {
if (q->r == MAX - 1)
return 1;
else
return 0;
}

void insert(pqueue *q) {
int x;
if (isfull(q)) {
printf("nQueue overflow..");
return;
} else {
printf("nEnter the element to be inserted:n");
scanf("%d", &x);
(q->r)++;
q->a[q->r] = x;
}
}

void delete(pqueue *q) {
int n;
n = q->a[q->f];
(q->f)++;
printf("The deleted element is = %d", n);
}

void display(pqueue *q1, pqueue *q2, pqueue *q3) {
int i;
if (isempty(q1))
printf("nQueue1 is empty..");
else
printf("nThe contents of queue1 are:n");
for (i = q1->f; i <= (q1->r); i++) {
printf("%dt", q1->a[i]);
}
if (isempty(q2))
printf("nQueue2 is empty..");
else
printf("nThe contents of queue2 are:n");
for (i = q2->f; i <= (q2->r); i++) {
printf("%dt", q2->a[i]);
}
if (isempty(q3))
printf("nQueue3 is empty..");
else
printf("nThe contents of queue3 are:n");
for (i = q3->f; i <= (q3->r); i++) {
printf("%dt", q3->a[i]);
}
}

/
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