Priority Queue Implementation: C source codes

A priority queue is data structure in which intrinsic ordering of the elements does determine the results of its basic operations. These are of two types- ascending (e.g. queue) and descending (e.g. stack).
The following source code implements ascending type priority queue in C:

// Ascending Priority Queue Implementation in C

#include<iostream.h>
    #include<conio.h>

    const int MAX=5;

    class pqueue
    {
          int front,rear;
        public:
          struct data
          {
           int val,p,o;
          }d[MAX];