Lecture 9: Introduction to Arrays in C++

In this Video, we are going to learn about Arrays, Reversing an Array and Linear Search

There is a lot to learn, Keep in mind “ Mnn boot karega k chor yrr apne se nahi yoga ya maza nahi para, Just ask 1 question “ Why I started ? “
Coding Ninjas

Homework: Added in Video already

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Intro Sequence: We have bought all the required Licenses of the Audio, Video & Animation used.

Timestamps:

00:00 - Introduction
03:10 - Promotion
04:18 - What is Array ?
09:05 - Why array ?
11:25 - Declaring Arrays
14:04 - Indexes in Array
16:36 - Accessing in array
17:55 - Initialisation in Arrays
20:11 - Homework
20:55 - Implementation
32:32 - Arrays with Functions
39:56 - Different types of Arrays
43:31 - Maximum/Minimum in an Array
54:10 - Scopes in Array
57:56 - Why arr[0] changed in main function ?
01:02:08 - Homework
01:04:44 - Linear Search
01:14:07 - Reverse an Array
01:27:31 - Some Question for next Video

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[kartikgupta]

Homework

#Question 1: (20:11)
We can initialize the array with any value by using the fill_n command

Example code:

#include<iostream>
using namespace std;

int main() {
int array[100];

//To initialize the array with value'1'.
fill_n(array, 100, 1);

//To check the array input (kewaal 5 hi kari h print)
for(int i = 0; i <= 5; i++){
cout << array[i] << endl;
}

}
//This is one of the method and the 'for loop' can also be used
but it is does not looks good and professional.

#Question 2: (1:02:52)
To calculate the sum of all the elements in the array
Code:
#include<iostream>
using namespace std;

int sumArr(int arr[], int n){
int sum = 0;
for(int i = 0; i<n; i++){
sum+=arr[i];
}
return sum;
}

int main() {
int a[100], n;
//Taking the size of the array
cin>>n;
//Taking the array from the user
for(int i = 0; i<n; i++) {
cin>>a[i];
}
cout<<"The sum of all the elements in the array is: " << sumArr(a, n) << endl;
}


gmail = 03kartikgupta

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Keep posting all the videos!

[aksv_]

1:26:00 for reversing the array
void reverseArray(int arr[], int n)
{

cout << "printing the reverse array" << endl;
for (int i = 1; i <= n; i++)
{
int a = n - i;
cout << arr[a] << " ";
}
cout << endl;
}

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[CodeingJourney]

int num[10]={3, 5, 6, 7, 8, 9, 0};
int size=7;
for(int i= size-1; i>=0; i--){
cout<<num[i]<<"\t";
}
we have use this method also for reversing the array.

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