This C++ Program demonstrates implementation of Queue in STL.

Here is source code of the C++ Program to demonstrate Queue in STL. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

`/*`

`* C++ Program to Implement Queue in Stl`

`*/`

`#include <iostream>`

`#include <queue>`

`#include <string>`

`#include <cstdlib>`

using namespace std;

int main()

`{`

queue<int> q;

int choice, item;

while (1)

`{`

cout<<"\n---------------------"<<endl;

cout<<"Queue Implementation in Stl"<<endl;

cout<<"\n---------------------"<<endl;

cout<<"1.Insert Element into the Queue"<<endl;

cout<<"2.Delete Element from the Queue"<<endl;

cout<<"3.Size of the Queue"<<endl;

cout<<"4.Front Element of the Queue"<<endl;

cout<<"5.Last Element of the Queue"<<endl;

cout<<"6.Exit"<<endl;

cout<<"Enter your Choice: ";

cin>>choice;

switch(choice)

`{`

case 1:

cout<<"Enter value to be inserted: ";

cin>>item;

q.push(item);

break;

case 2:

item = q.front();

q.pop();

cout<<"Element "<<item<<" Deleted"<<endl;

break;

case 3:

cout<<"Size of the Queue: ";

cout<<q.size()<<endl;

break;

case 4:

cout<<"Front Element of the Queue: ";

cout<<q.front()<<endl;

break;

case 5:

cout<<"Back Element of the Queue: ";

cout<<q.back()<<endl;

break;

case 6:

exit(1);

break;

default:

cout<<"Wrong Choice"<<endl;

`}`

`}`

return 0;

`}`

$ g++ queue.cpp $ a.out --------------------- Queue Implementation in Stl --------------------- 1.Insert Element into the Queue 2.Delete Element from the Queue 3.Size of the Queue 4.Front Element of the Queue 5.Last Element of the Queue 6.Exit Enter your Choice: 1 Enter value to be inserted: 9 --------------------- Queue Implementation in Stl --------------------- 1.Insert Element into the Queue 2.Delete Element from the Queue 3.Size of the Queue 4.Front Element of the Queue 5.Last Element of the Queue 6.Exit Enter your Choice: 1 Enter value to be inserted: 8 --------------------- Queue Implementation in Stl --------------------- 1.Insert Element into the Queue 2.Delete Element from the Queue 3.Size of the Queue 4.Front Element of the Queue 5.Last Element of the Queue 6.Exit Enter your Choice: 1 Enter value to be inserted: 7 --------------------- Queue Implementation in Stl --------------------- 1.Insert Element into the Queue 2.Delete Element from the Queue 3.Size of the Queue 4.Front Element of the Queue 5.Last Element of the Queue 6.Exit Enter your Choice: 1 Enter value to be inserted: 6 --------------------- Queue Implementation in Stl --------------------- 1.Insert Element into the Queue 2.Delete Element from the Queue 3.Size of the Queue 4.Front Element of the Queue 5.Last Element of the Queue 6.Exit Enter your Choice: 1 Enter value to be inserted: 5 --------------------- Queue Implementation in Stl --------------------- 1.Insert Element into the Queue 2.Delete Element from the Queue 3.Size of the Queue 4.Front Element of the Queue 5.Last Element of the Queue 6.Exit Enter your Choice: 1 Enter value to be inserted: 4 --------------------- Queue Implementation in Stl --------------------- 1.Insert Element into the Queue 2.Delete Element from the Queue 3.Size of the Queue 4.Front Element of the Queue 5.Last Element of the Queue 6.Exit Enter your Choice: 3 Size of the Queue: 6 --------------------- Queue Implementation in Stl --------------------- 1.Insert Element into the Queue 2.Delete Element from the Queue 3.Size of the Queue 4.Front Element of the Queue 5.Last Element of the Queue 6.Exit Enter your Choice: 4 Front Element of the Queue: 9 --------------------- Queue Implementation in Stl --------------------- 1.Insert Element into the Queue 2.Delete Element from the Queue 3.Size of the Queue 4.Front Element of the Queue 5.Last Element of the Queue 6.Exit Enter your Choice: 5 Back Element of the Queue: 4 --------------------- Queue Implementation in Stl --------------------- 1.Insert Element into the Queue 2.Delete Element from the Queue 3.Size of the Queue 4.Front Element of the Queue 5.Last Element of the Queue 6.Exit Enter your Choice: 2 Element 9 Deleted --------------------- Queue Implementation in Stl --------------------- 1.Insert Element into the Queue 2.Delete Element from the Queue 3.Size of the Queue 4.Front Element of the Queue 5.Last Element of the Queue 6.Exit Enter your Choice: 3 Size of the Queue: 5 --------------------- Queue Implementation in Stl --------------------- 1.Insert Element into the Queue 2.Delete Element from the Queue 3.Size of the Queue 4.Front Element of the Queue 5.Last Element of the Queue 6.Exit Enter your Choice: 4 Front Element of the Queue: 8 --------------------- Queue Implementation in Stl --------------------- 1.Insert Element into the Queue 2.Delete Element from the Queue 3.Size of the Queue 4.Front Element of the Queue 5.Last Element of the Queue 6.Exit Enter your Choice: 6 ------------------ (program exited with code: 1) Press return to continue

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