N /整数类型问题 [英] N/a integer type problem

问题描述

Plase，我有一个带有整数属性的类，但是其中一些是N / A - 不可用，我怎么能用整数写，但不能用零？

例如

public int speed;



然后我上课了车和速度，我简化了：

car c1 =新车（250）;

车c2 =新车（300）;

车c =新车（N / A）; //这辆车是原型，我们还不知道速度，我怎么写... N / A？不改变valute类型整数？因为所有其他人都使用整数，我希望它是int nubmers ...



我尝试了什么：



尝试使用零值，但这不是我想要的......：/

Plase, I have a class with integers attributes, but some of them are N/A - not avilable, how can I write in using integer, but not using zero?
e.g.
public int speed;

and then I have class with cars and speeds, I simplified:
car c1 = new car(250);
car c2 = new car(300);
car c = new car(N/A); // and this car is a prototype and we don´t know the speed yet, how do I write .. N/A? without changing valute type integer? cause all of the others are using integer and I want it to be int nubmers...

What I have tried:

tried using zero value, but it is not exactly what I want ... :/

推荐答案

尝试使用null-able类型和传递空值：

Try using null-able types and passing nulls:

public class car
{
    public car(int? init)
    {
         value = init;
    }
    private int? value;
...
}

var c = new car(null); // n/a

使用可空的int

Use a nullable int

int? x;

x = null;
if (x.HasValue)
{
    Debug.WriteLine(x.Value);
}

x = 123;
if (x.HasValue)
{
    Debug.WriteLine(x.Value);
}

那么让你的Car构造函数接受int吗？作为一个参数，您可以为无值传递null。

So make your Car constructor accept int? as a param and you can pass null for "no value".

这篇关于N /整数类型问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！