Right Shift

intmain() {
int arr[10] = {10,20,30,40,50};
int size =5;
int element, index;

    cout <<"Array before editing: " << endl;
for (int i =0; i < size; i++) {
        cout << arr[i] <<" ";
    }
    cout << endl;

    cout <<"Enter element to insert: ";
    cin >> element;
    cout <<"Enter index to insert element at (0 - " << size <<"): ";
    cin >> index;

if (index <0 || index > size) {
        cout <<"Invalid index!" << endl;
    }else {
for (int i = size; i > index; i--) {
            arr[i] = arr[i -1];
        }
        arr[index] = element;
        size++;

        cout <<"Array after editing: " << endl;
for (int i =0; i < size; i++) {
            cout << arr[i] <<" ";
        }
        cout << endl;
    }

return0;
}

Left Shift

#include<iostream>
usingnamespace std;

intmain() {
int arr[10] = {10,20,30,40,50};
int size =5;
int element, index;

    cout <<"Array before editing: " << endl;
for (int i =0; i < size; i++) {
        cout << arr[i] <<" ";
    }
    cout << endl;

    cout <<"Enter element to insert: ";
    cin >> element;
    cout <<"Enter index to insert element at (0 - " << size <<"): ";
    cin >> index;

if (index <0 || index > size) {
        cout <<"Invalid index!" << endl;
    }else {

for (int i = index; i < size; i++) {
            arr[i] = arr[i +1];
        }

// Place the new element at the last position
        arr[size -1] = element;

// size stays the same (we replaced an element)
// If you want to increase size, you can adjust accordingly

// Print array after editing
        cout <<"Array after editing (Left Shift): " << endl;
for (int i =0; i < size; i++) {
            cout << arr[i] <<" ";
        }
        cout << endl;
    }

return0;
}

Remove an element from the array

// Delete an element from the array

int size = 5;
int element = 0;
int index = 0;
int arr[size] = {10, 20, 30, 40, 50};

cout << "Array before editing: ";
for (int i = 0; i < size; i++) {
    cout << arr[i] << " ";
}
cout << endl;

// Here, I ask the user which number they want to delete
cout << "Enter the element that you want to delete: ";
cin >> element;

// How will I delete it?
// To delete it, I need to access its index
// How do I reach its index?
// I will loop through all the elements of the array
for (int i = 0; i < size; i++) {
    if (element == arr[i]) {
        index = i; // index = 2
    }
}

// Now I have the element, how do I delete it???
for (int i = index; i < size - 1; i++) {
    arr[i] = arr[i + 1];
}
size--;

cout << "Array after editing: ";
for (int i = 0; i < size; i++) {
    cout << arr[i] << " ";
}

Searching for an element in the array

#include <iostream>
using namespace std;

int main() {
    int arr[] = {10, 3, 6, 9, 11};
    int size = sizeof(arr) / sizeof(arr[0]);

    int element;
    bool found = false;
    int index = -1;

    cout << "Array: ";
    for (int i = 0; i < size; i++) {
        cout << arr[i] << " ";
    }
    cout << endl;

    cout << "Enter element to search: ";
    cin >> element;

    for (int i = 0; i < size; i++) {
        if (arr[i] == element) {
            index = i;
            found = true;
            break;
        }
    }

    if (found) {
        cout << "Found at index: " << index << endl;
    } else {
        cout << "Not found" << endl;
    }

    return 0;
}

2d Array

Write a program that takes the elements of a 3×3 two-dimensional array from the user and then prints them on the screen.

int main() {   

int arr[3][3];

cout << "Enter elements of 3x3 array: " << endl;
for(int i = 0; i<3 ; i++){
    for (int j = 0 ; j<3 ; j++){
        cout << "Element at position [" << i << "][" << j << "]: ";
        cin >> arr[i][j];
    }
}

cout << "\\n your arr :\\n";
for(int i = 0; i<3 ; i++){
    for (int j = 0 ; j<3 ; j++){
        cout << arr[i][j] << " ";
    }
}
    return 0;
}