CONTOH PROGRAM QUEUE DENGAN C++

Dibawah ini adalah salah satu contoh program queue yang pernah saya buat untuk tugas praktek kuliah. Semoga nantinya bisa sedikit membantu kalian mempelajari tentang pemrograman c++

#include<stdio.h>
#include<iostream.h>
#include<conio.h>
#define QSIZE 5
int front=0,rear=-1,q[QSIZE];
void insert(int x)
{

rear=(rear+1)%QSIZE;
q[rear]=x;
}
int del()
{
int t=0;
if(rear<=-1)
cout<<"\nQueue is empty.\n\n";
else
{
t=q[front];
if(front!=rear)
front=(front+1)%QSIZE;
else
{
front=0;
rear=-1;
}
}
return t;
}
void display()
{
int i;
if(rear<=-1)
cout<<"\nQueue is empty.\n\n";
else
{
cout<<"\nThe queue is\n";
for(i=front;i!=rear;i=(i+1)%QSIZE)
cout<<q[i]<<" \t";
cout<<q[i]<<" \n";
}
}
void destroy()
{
int i=0;
if(rear<=-1)
cout<<"\nQueue is empty.\n\n";
else
for(i=front;i<=rear;i=(front+1)%QSIZE)
del();
if(i!=0)
cout<<"\nQueue is destroy.\n\n";
}
void main()
{
int ch,in,d;
clrscr();
do
{
cout<<"\nMain Menu\n\n";
cout<<"1.Insert\n";
cout<<"2.Delete\n";
cout<<"3.Display\n";
cout<<"4.Destroy\n";
cout<<"5.Exit\n\n";
cout<<"Enter your choice:";
cin>>ch;
switch(ch)
{
case 1:clrscr();
if(front==(rear+1)%QSIZE && rear>=QSIZE-1)
cout<<"\nQueue is full\n\n";
else
{
cout<<"\nEnter the element to be inserted:";
cin>>in;
insert(in);
clrscr();
}
break;
case 2:clrscr();
d=del();
if(d!=0)
cout<<"\nElement deleted="<<d<<"\n\n";
break;
case 3:clrscr();
display();
break;
case 4:clrscr();
destroy();
break;
case 5:break;
default:clrscr();
cout<<"\nEnter an appropriate choice.\n\n";
}

}
while(ch!=5);
}