如何向未初始化的变量添加内容？ c#

Question

Im trying to make a cookie clicker style thing where every time you click something it adds 1 to a variable. Im trying to do int clicks = clicks + 1 but it says that it is use of an uninitialized variable. I tried to set int clicks = 0 but then it says that clicks is already defined in the scope. I tried to see if i could do something like if (clicks == null) but obviously it cant check it because it is not a variable. I have only used c# for like a day, can someone please help?

    private void cookie_Click(object sender, EventArgs e)
    {
        int clicks = 0;
        clicks = clicks + 1;
        numClicks.Text = "" + clicks;
    }

^ this is the code. i also realized when i click it, it resets itself to 0 and goes back to 1, so it cant go 1, 2, 3 etc. is there a way to set the variable when the form starts and then start to add on clicks? im so dumb

Answer 1

int clicks = clicks + 1;

Is indeed nonsensical. This is the code that is declaring and initializing clicks , so it makes perfect sense that we can't ask "what is the value of clicks ?" (in order so we can add one to it); until we have definitely assigned a value to clicks , the value is undefined .

Instead:

int clicks = 0;

And then when you want to increment it:

clicks++;

Answer 2

You'll want to do something like this:

int clicks = 0;//Define an integer 'clicks' and set it to 0
//and in your click handler:
clicks = clicks + 1;//Increment your count.

Note:

• Clicks is an integer, it can never be null. (look up c# primitives for more info)
• Using int clicks = clicks + 1 doesn't make sense. At the right side of the equation, what's the value of clicks? It's not defined yet.

Answer 3

The problem with your implementation is that every time the function gets called the first thing it does is sets clicks to 0. You need to initialize it outside of the function to avoid this. If you initialize it in the class it will be set to 0 initially when the class is created then you can increase the value everytime the functions is called. Not sure exactly your use case but without more information I would recommend doing something like this.

class YourClass {
    // initialize outside of the function that increases the counter
    int clicks = 0;
    // rest of the code in class

    private void cookie_Click(object sender, EventArgs e)
    {
        clicks++;
        // this would also work: clicks = clicks + 1;
        numClicks.Text = "" + clicks;
    }
}