Write a C++ program to implement enqueue, dequeue

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March 20, 2023

Write a C++ program to implement enqueue, dequeue

Q#1
Write a C++ program to implement enqueue, dequeue, get front value and
count function using arrays.
#include <iostream>
using namespace std;
int queue[100], n = 100, front = – 1, rear = – 1;
void Insert() {
int val;
if (rear == n – 1)
cout<<“Queue Overflow”<<endl;
else {
if (front == – 1)
front = 0;
cout<<“Insert the element in queue : “<<endl;
cin>>val;
rear++;
queue[rear] = val;
}
}
void Delete() {
if (front == – 1 || front > rear) {
cout<<“Queue Underflow “;
return ;
} else {
cout<<“Element deleted from queue is : “<< queue[front] <<endl;
front++;;
}
}
void Display() {
if (front == – 1)

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cout<<“Queue is empty”<<endl;
else {
cout<<“Queue elements are : “;
for (int i = front; i <= rear; i++)
cout<<queue[i]<<” “;
cout<<endl;
}
}
int main() {
int ch;
cout<<“1) Insert element to queue”<<endl;
cout<<“2) Delete element from queue”<<endl;
cout<<“3) Display all the elements of queue”<<endl;
cout<<“4) Exit”<<endl;
do {
cout<<“Enter your choice : “<<endl;
cin>>ch;
switch (ch) {
case 1: Insert();
break;
case 2: Delete();
break;
case 3: Display();
break;
case 4: cout<<“Exit”<<endl;
break;
default: cout<<“Invalid choice”<<endl;
}
} while(ch!=4);
return 0;
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