C++ IBM -EDX Lab : Make a Number

Here is one of the lab exercises from the C++ class. The EDX course is run by IBM. I have included my code below the bottom.

Lab: Make a Number

Mark gets n numbers in an array. Write a program considering only the single digit even numbers in the array and make a number by combining those even numbers alone.

If there are no single digit even numbers found in an array, then display the output message as “Single digit even number is not found in the array”. If the array size is zero or lesser, then display the output message as “Invalid array size”.

Implement the following methods.

Implement ‘main’: In this method, get the input by the user and store it in an array. Check if the given number in an array is having a single digit even number. Implement the logic by considering only the single digit even numbers.

For example:

Consider an input value {2,7,41,4} stored in an array. In the given array, get the single digit even numbers which are 2 and 4. Implement a logic using these even numbers, such that the output is 24.

Note: Please avoid the usage of exit(0) in your code.  

Sample Input 1:

Enter the size of an array:

4

Enter the array elements:

45

4

56

8

Sample Output 1:

48

 

Sample Input 2:

Enter the size of an array:

0

Sample Output 2:

Invalid array size

 

Sample Input 3:

Enter the size of an array:

4

Enter the array elements:

3

9

10

29

Sample Output 3:

Single digit even number is not found in the array

My C++ Code (score 100/100):

#include <iostream>

#include <string>

using namespace std;

 

int main()  

{

    int array_len;

   

    cout << "Enter the size of an array:";

    cin >> array_len;

   

    if (array_len <= 0){

        cout << "Invalid array size" <<endl;

    }

    else {

        int digits[array_len];

        string s1, value;

        cout << "Enter the array elements:" << endl;

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

            cin >> digits[i];

        }

        for (int j = 0; j < array_len; j++ ){

            if (digits[j] % 2 == 0  && digits[j] < 10){

                s1 = to_string(digits[j]);

                value += s1;

            }

        }

        if (value == ""){

            cout << "Single digit even number is not found in the array";

        }

        else{

            int val_out = stoi(value);

            cout << val_out;

        }  

    }