Introduction to Queue Data Structure | C++ Placement Course | Lecture 24.1

[JackCoderr]

very nice and precise explaination, ,, thank you so much didi...

[studytoon]

here's the code :)
#include <iostream>
using namespace std;
#define n 20
class queue{
int * arr;int back;
int front;
public:
queue(){
arr=new int[n];
front=-1;
back=-1;
}
void Enqueue(int x){
if (back==n-1){
cout<<"stack over flowed"<<endl;
return;
}
back++;
arr[back]=x;
if(front==-1){
front ++;
}
}
void Dequeue(){
if (front==-1||front>back){
cout<<"queue is empty";
}
front++;
}
int peek(){
if (front==-1||front>back){
cout<<"queue is empty";
}
return arr[front];
}
bool empty (){
if (front==-1||front>back){

return true;
}
return false;
}
};
int main(){
queue q;
q.Enqueue(5);
q.Enqueue(8);
q.Enqueue(9);
cout<<q.peek()<<endl;
q.Dequeue();
cout<<q.peek()<<endl;
return 0;
}

[mudassirshoukat]

Thank you sister. Your lecture helped me.

[arifazaib]

Thanks a lot. You made programming easier for me

[hammadfaiz]

In pop operation first we have to reset the values of front and rear to -1.After that we have to increment the front otherwise the code will not work perfectly. See this
int pop()
{
int data;
//check empty or not
if (empty()) {cout << " empty" << endl;}
else {data=arr[front];}
if (front >= rear)//reset values back to -1 then increment the front
{
front = -1;
rear = -1;
}
else
{
front++;

}
return data;
}

[islamicTv-fxtx]

Are yaar aache se samaj aaya hame 😌 apka dhanyavaad ☺

[AmanSingh-rzrj]

Thank you so much di
I need this video

[harshaaravala]

Goddamn this is good. I was skeptical at first about a free yt video but it fares much better than a lot of paid ones. Only issue was the mic was a bit loud at times and the case of checking if the queue is empty could be elaborated but otherwise it does a really good job of getting across what is necessary.

[rahulkumarsharma]

Didi is so busy in shifting from apni kaksha to apna college that in the intro she said "welcome to apni kaksha" instead of apna college.
Apart from that you are a great teacher

[hustler]

Didi said '' welcome to apni Anybody noticed?

[lenovoxcarbon]

11:41 My man got popcorns even before getting the tickets for the movie XD

[iemmadhav]

But bhaiya big big big thanks to you. You are above all ❤️

[hassixmalik]

Great way of conveying. One recomendation is that if you replace mic for recording audio then it would be much better because there is a lot of distortion in your mic

[raghavpatodiya]

This code is wrong at soo many levels, the most prominent one being, like here we have fixed length queue of 20, now in main function try to enqueue 15 times, dequeue 10 times, and then again try to enqueue 10 times, then you will understand that even when the queue seems empty it will output queue is full.
Basically the dequeue functions is wrong, it should be as following -
void dequeue(){
if (front==-1 || front>back) {
cout << "Queue is already empty" << endl;
return;
}
for (int i = front; i < back; i++) {
arr[i] = arr[i + 1];
}
back--;
// if queue becomes empty
if(front>back){
front = -1;
back=-1;
}
}
so that when you dequeue, it actually empties the queue for the dequeued values, and when all the enqueued values are dequeued, it resets front and back to -1.
hope It helps, i had to spend hours to find the problem and debug it for all the possible testcases.

[sushantphalke]

video is amazing like every video
your voice is also amazing .
but what happened with mic its super annoying ear burned

[blazemates]

Is it better to use return statement in if rather than if else?if y or n how

[shaileshhacker]

9:31
//Ninja Technique to write empty() function...

bool empty()
{

return front == -1 || front > back;
}

[viveksingh_]

Mam mic issue is super annoying.
Please take care of that next time.
Else video is very nice.

[soumikmukherjee]

A random girl named Neha after listening her name again and again on this course be like:
"Maine kya bigaada tha aapka"

[AbhishekGupta-lwtb]

Ma'am don't know how to thank you, but Ma'am Really Thank You, literally
Aaj tak jo cheeg samajh nahi paaya tha wo bhi aapke samjhane se samajh gaya, Dhanyawad Maam
Aap Aise hi padhati raho, hum padhte rahe aur jaldi jaldi cheezo ko seekh ke aage badhte rahe Ma"am