添加参数的问题 [英] Problem with adding parameters

问题描述

您好！



我是编程新手，遇到以下练习的问题：



class program

{

public static void Main（string [] args）

{

string n = Calculator.WriteNumber（53 + 28）;

Console.WriteLine（n）;



Console.ReadLine（）;



我对（53 +28）部分感到困惑。如何添加算术符号？



< b>我尝试了什么：



我创建了以下编译的类（当Calculator.WriteNumber（53,28）;）





类计算器

{



公共静态字符串WriteNumber（int a，int b）

{

int c = a + b;

string result = c.ToString（）;

返回结果;

}

Hello!

I am new to programming and am experiencing issues with a the following exercise:

class program
{
public static void Main(string[] args)
{
string n=Calculator.WriteNumber(53+28);
Console.WriteLine(n);

Console.ReadLine();

I am confused by the (53 +28) part.How do I add an arithmetic sign?

What I have tried:

I created the following class which compiles( when Calculator.WriteNumber(53,28);)


class Calculator
{

public static string WriteNumber(int a ,int b)
{
int c = a + b;
string result = c.ToString();
return result;
}

推荐答案

5 3 + 28 计为一个参数（因此您仍然需要提供第二个参数）：当您调用 WriteNumber 时，它将需要81（即53 + 28）作为参数 a 。它没有得到不同的处理，因为有一个算术符号： 53 + 28 评估为 81 这是一个 int 在这里你把它传递给参数 a 。

53+28 counts as one parameter (so you still have to supply a second one): when you call WriteNumber, it will take 81 (i.e. 53 + 28) as parameter a. It does not get differently treated because there is an arithmetic sign: 53 + 28 evaluates to 81 which is one int and here you pass it as parameter a.

你可以尝试

You could try

string n = Calculator.WriteNumber(53, 28);

代替。

增加是由 WriteNumber 方法。

您可以在传递方法参数之前对其执行操作：

instead.
The addition is realized by the WriteNumber method.
You can perform operations on method's parameters prior to passing them:

string n = Calculator.WriteNumber(10 - 5, 2 * 2);

这相当于

This is equivalent to

string n = Calculator.WriteNumber(5, 4);

并将返回 9 。

要传递两个参数，请用逗号分隔它们，就像声明方法时一样：

To pass two parameters, you separate them with a comma, just as you do when you declare the method:

string n=Calculator.WriteNumber(53, 28);

如果你想传递一个运算符，那我就用枚举来做：

If you want to pass an operator, then I'd do it with an enum:

public enum Operators
   {
   Plus,
   Minus,
   Times,
   DivideBy,
   }

然后：

Then:

public static string Calculate(int a, Operators op, int b)
    {
    int result;
    switch (op)
        {
        case Operators.Plus: result = a + b; break;
        case Operators.Minus: result = a - b; break;
        case Operators.Times: result = a * b; break;
        case Operators.DivideBy: result = a / b; break;
        default: throw new ArgumentException("Unknown Operator: " + op);
        }
    return result.ToString();
    }

然后你这样称呼：

You then call it like this:

string n = Calculator.Calculate(53, Operators.Plus, 28);

请注意，我更改了方法的名称：除非实际写入内容，否则不要调用WriteNumber！

Note that I changed the name of your method: don't call something "WriteNumber" unless it actually writes something!

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