3.program to implement sequential search:

 #include<iostream>

using namespace std;

int main() {

    int arr[10];

    int no_of_elements; // Correct the variable name

    int key;

    bool found = false;

    cout << "enter the number of elements:"; // Correct the prompt

    cin >> no_of_elements;

    for (int i = 0; i < no_of_elements; i++) {

        cout << "arr[" << i << "]:";

        cin >> arr[i];

    }

    cout << "enter the value to search:";

    cin >> key;

    for (int i = 0; i < no_of_elements; i++) {

        if (key == arr[i]) {

            found = true;

            cout << "the value is found at index arr[" << i << "]";

            break; // Exit the loop once the key is found

        }

    }

    if (!found) {

        cout << "key not found!";

    }

    return 0;

}

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/tmp/nnypIrDI2Y.o

enter the number of elements:3

arr[0]:2

arr[1]:3

arr[2]:4

enter the value to search:4

the value is found at index arr[2]