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#define SIZE 5            /* Size of Queue */
int PQ[SIZE],f=0,r=-1;       /* Global declarations */

PQinsert(int elem)
{
 int i;       /* Function for Insert operation */
 if( Qfull()) printf("nn Overflow!!!!nn");
 else
 {
  i=r;
  ++r;
  while(PQ[i] <= elem && i >= 0) /* Find location for new elem */
  {
   PQ[i+1]=PQ[i];
   i--;
  }
  PQ[i+1]=elem;
 }
}

int PQdelete()
{                      /* Function for Delete operation */
 int elem;
 if(Qempty()){ printf("nnUnderflow!!!!nn");
 return(-1); }
 else
 {
  elem=PQ[f];
  f=f+1;
  return(elem);
 }
}

int Qfull()
{                     /* Function to Check Queue Full */
 if(r==SIZE-1) return 1;
 return 0;
}

int Qempty()
{                    /* Function to Check Queue Empty */
 if(f > r) return 1;
 return 0;
}

display()
{                  /* Function to display status of Queue */
 int i;
 if(Qempty()) printf(" n Empty Queuen");
 else
 {
  printf("Front->");
  for(i=f;i<=r;i++)
   printf("%d ",PQ[i]);
  printf("<-Rear");
 }
}

main()
{                         /* Main Program */
 int opn,elem;
 do
 {
  clrscr();
  printf("n ### Priority Queue Operations(DSC order) ### nn");
  printf("n Press 1-Insert, 2-Delete,3-Display,4-Exitn");
  printf("n Your option ? ");
  scanf("%d",&opn);
  switch(opn)
  {
  case 1: printf("nnRead the element to be Inserted ?");
  scanf("%d",&elem);
  PQinsert(elem); break;
  case 2: elem=PQdelete();
  if( elem != -1)
   printf("nnDeleted Element is %d n",elem);
  break;
  case 3: printf("nnStatus of Queuenn");
  display(); break;
  case 4: printf("nn Terminating nn"); break;
  default: printf("nnInvalid Option !!! Try Again !! nn");
  break;
  }
  printf("nnnn  Press a Key to Continue . . . ");
  getch();
 }while(opn != 4);
}

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