如何从int取值？ C＃

Question

The problem is on line 3, I need to take away a number between 1-3 and save the value so more can be taken away.

Random randomhit = new Random();
int randomNumberhit = randomhit.Next(1, 4);
int life = life - randomNumberhit;
Console.WriteLine(life);

Any ideas? Am I doing it completely wrong?

Answer 1

You're declaring the variable life and assigning it a value of life - randomhit . How can you know the result of the calculation if life doesn't yet have a value?

Try something like this:

int life = 100;
...
Random randomhit = new Random();
int randomNumberhit = randomhit.Next(1, 4);
life = life - randomNumberhit;
Console.WriteLine(life);

However, you may want to make life class variable instead. Something like this would work:

public class MyGuy
{

    public int Life { get; set; }

    public MyGuy()
    {
        this.Life = 100; // starting life
    }

    public void Hit()
    {
        Random randomhit = new Random();
        int randomNumberhit = randomhit.Next(1, 4);
        this.Life -= randomNumberhit;
        Console.WriteLine(this.Life);
    }
}

Answer 2

life need to be initalized to something

int life = 100; //Or some other value
Random randomhit = new Random();
int randomNumberhit = randomhit.Next(1, 4);
life = life - randomNumberhit;
Console.WriteLine(life);

Also note that when life is reassigned ( life = life - randomNumberhit; ) the int is not needed.

Answer 3

You are doing life-randomNumberhit , but at that point your variable life does not exist yet. You should initialize your life variable to whatever value you want:

Random randomhit = new Random();
int randomNumberhit = randomhit.Next(1, 4);
int life = 0; // for instance, 0
Console.WriteLine(life - randomNumberhit);