Home/ Gary Christan/Answers
  1. Asked:

    How to use function members of a class recursively?

    Gary Christan

    Front-ending a recursive algorithm that, by its normative nature uses a parameterized gating is what I think you're actually trying to ask about. For a linked list, for example, given this procedural typical recursive solution where the descent is parameterized and the base-case is exit-on-null: strRead more

    Front-ending a recursive algorithm that, by its normative nature uses a parameterized gating is what I think you’re actually trying to ask about. For a linked list, for example, given this procedural typical recursive solution where the descent is parameterized and the base-case is exit-on-null:

    struct Node
{
    int data;
    Node *next;
};

void print_list(Node *p)
{
    if (!p)
        return;

    std::cout << p->data << ' ';
    print_list(p->next);
}

    You can do the same thing with a member function by throwing that base logic in as a condition of the recursion. For example:

    struct Node
{
    Node *next;
    int data;
    
    void print()
    {
        std::cout << data << ' ';
        if (next)
        {
            next->print();
        }
    }
};

    The same modus-operandi can be extended to more complex structures like a BST node:

    struct BSTNode
{
    BSTNode *left;
    BSTNode *right;
    int data;
    
    void inorder()
    {
        if (left)
            left->inorder();

        std::cout << data << ' ';

        if (right)
            right->inorder();
    }
};

    At least I think that’s what you’re asking about.

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  2. Asked:

    When will the Python special method (i.e. magic method) __len__ be called?

    Best Answer
    Gary Christan

    This is because you're testing the truthiness of tail.pnext as a while condition in this line: while tail.pnext: According to Python's documentation of Truth Value Testing: By default, an object is considered true unless its class defines either a __bool__() method that returns False or a __len__() Read more

    This is because you’re testing the truthiness of tail.pnext as a while condition in this line:

    while tail.pnext:

    According to Python’s documentation of Truth Value Testing:

    By default, an object is considered true unless its class defines either a __bool__() method that returns False or a __len__() method that returns zero, when called with the object.

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  3. Asked:

    I am getting this error io.github.bonigarcia.wdm.config.WebDriverManagerException: io.github.bonigarcia.wdm.config.WebDriverManagerException: java.net.UnknownHostException: chromedriver.storage.googleapis.com

    Gary Christan

    Check your internet Connection. This error comes when internet connection is not established

    Check your internet Connection. This error comes when internet connection is not established

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  4. Asked:

    How to download win 11?

    Gary Christan

    From this link download the Window 11 (64/32 bits): https://www.microsoft.com/software-download/windows11

    From this link download the Window 11 (64/32 bits):

    https://www.microsoft.com/software-download/windows11
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  5. Asked:

    beforetest java.lang.NullPointerException: Cannot invoke “org.openqa.selenium.WebDriver.manage()” because “this.driver” is null

    Best Answer
    Gary Christan

    Your WebDriver is not defined  in beforeTest: public void beforetest() { WebDriverManager.chromedriver().setup(); driver = new ChromeDriver(); driver.manage().timeouts().implicitlyWait(10,TimeUnit.SECONDS); driver.get("https://example.com/"); }  

    Your WebDriver is not defined  in beforeTest:

    public void beforetest() {

WebDriverManager.chromedriver().setup();
driver = new ChromeDriver();
driver.manage().timeouts().implicitlyWait(10,TimeUnit.SECONDS);
driver.get("https://example.com/");
}

     

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    • 4
  6. Asked:

    Converting a python list into a dictionary while specifying certain elements as keys and values

    Best Answer
    Gary Christan

    We could use a loop: out = {} for item in My_list: if item.startswith('I'): out[item] = [] current = item else: out[current].append(item) Output: {'I=113': ['PLAN=1', 'A=0PDFGB', 'B=23FGC', 'C=26TGFGD', 'D=19TGE', 'E=18TGA'], 'I=120': ['PLAN=2', 'A=0PDFGB', 'B=23FGC', 'C=26TGFGD', 'D=19TGE', 'E=18TGRead more

    We could use a loop:

    out = {}
for item in My_list:
    if item.startswith('I'):
        out[item] = []
        current = item
    else:
        out[current].append(item)

    Output:

    {'I=113': ['PLAN=1', 'A=0PDFGB', 'B=23FGC', 'C=26TGFGD', 'D=19TGE', 'E=18TGA'],
 'I=120': ['PLAN=2', 'A=0PDFGB', 'B=23FGC', 'C=26TGFGD', 'D=19TGE', 'E=18TGA']}
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  7. Asked:

    Debian in Virtual Machine is not starting on Windows 10.

    Best Answer
    Gary Christan

    Go to the VM. Click on Installed Debian (Which is not working). Go to Start button aand click on dropdown next to it. Select Re-Install and hit enter button. Debian will be Restart. Select GUI Advanced mode (Safe Recovery). Re install Debian in GUI Mode

    Go to the VM.

    Click on Installed Debian (Which is not working).

    Go to Start button aand click on dropdown next to it.

    Select Re-Install and hit enter button.

    Debian will be Restart.

    Select GUI Advanced mode (Safe Recovery).

    Re install Debian in GUI Mode

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  8. Asked:

    How to change the default integrated terminal folder in remote wsl vscode

    Best Answer
    Gary Christan

    So, turns out i found the solution. To anyone who's struggling with this problem, the problem was (in my case at least) in one of the env variables that vscode was running wsl with. It is called PRE_NAMESPACE_PWD. If you run WSL with debug enabled (to do this just go to the wsl remote extension settRead more

    So, turns out i found the solution. To anyone who’s struggling with this problem, the problem was (in my case at least) in one of the env variables that vscode was running wsl with. It is called PRE_NAMESPACE_PWD. If you run WSL with debug enabled (to do this just go to the wsl remote extension settings and turn on the “Remote WSL:Debug” option.) you’ll notice the “env” options in wsl command with all env variables listed there, and if you keep scrolling you’ll notice two variables: PRE_NAMESPACE_PWD and PWD. In this problem, the PRE_NAMESPACE_PWD was pointing to the windows vscode folder instead of the current workspace folder in wsl and the PWD variable was using this folder. To summarize i just exported this PRE_NAMESPACE_PWD variable with the value “${cwd}” which is a command that gets the current workspace folder in my vscode. To do this, simply add this line to your remote Settings.json file:

    "terminal.integrated.env.linux": {
    "PRE_NAMESPACE_PWD": "${cwd}"
  }

    And that’s it, now everytime you click on “Open with integrated terminal” your terminal is going to open in the right workspace directory.

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  9. Asked:

    How can I test if an integerForKey is equal to nil? Using NSUserDefaults

    Best Answer
    Gary Christan

    The integerForKey always returns a value. If nothing's there, just 0. So you should check like that: if let currentValue = NSUserDefaults.standardUserDefaults().objectForKey("Code"){ //Exists }else{ //Doesn't exist }

    The integerForKey always returns a value. If nothing’s there, just 0.

    So you should check like that:

    if let currentValue = NSUserDefaults.standardUserDefaults().objectForKey("Code"){
    //Exists
}else{
    //Doesn't exist
}
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  10. Asked:

    Unchecked runtime.lastError: The message port closed before a response was receive

    Best Answer
    Gary Christan

    I disabled all installed extensions in Chrome - works for me. I have now clear console without errors.

    I disabled all installed extensions in Chrome – works for me. I have now clear console without errors.

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