Doubt doubt doubt

#1

https://ide.codingblocks.com/s/480784 —> Please Check my code.

#2 
 if (first > last)
    {
        cout << "not found" << endl;
        return; // why do i have to write a return statement here??
                // Can you explain whats happens if i do not put a return statement here. its not working without return.
    }

you need to return from here because if first > last it means we don’t have array now so we don’t want to execute the code below this

you can also use else condition to wrap other part Like this

void findNum(int *arr, int first, int last, int k)
{
    if (first > last)
    {
        cout << "not found" << endl;
        //  no need of return statement now
    }else{
        int mid = (first + last) / 2;
        if (arr[mid] > k)
        {
            findNum(arr, first, mid - 1, k);
        }
        else if (arr[mid] < k)
        {
            findNum(arr, mid + 1, last, k);
        }
        else
        {
            cout << mid << endl; // Also do i need a return statement here??
        }
    }
}

also

 else
        {
            cout << mid << endl; // Also do i need a return statement here??
        }

no need to return from here as code will automatically goes to the end of execution

#3

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