# Hello World

访问链接安装适合自己机器的 .NET 6 环境: https://docs.microsoft.com/zh-cn/dotnet/core/install/

运行下面的命令创建项目，编写第1个.NET 6 C# 程序:

```bash
dotnet new console --output sample1
dotnet run --project sample1
```

以下程序中，不能正确输出`"Hello,World!"`内容的是：

## 答案

```csharp
var str1 = "Hello,";
var str2 = "World!";
Console.WriteLine("str1"+"str2");
```

## 选项

### A

```csharp
var str1 = "Hello,";
var str2 = "World!";
Console.WriteLine(str1+str2);
```

### B

```csharp
Console.WriteLine("Hello, World!");
```

### C

```csharp
var str = "Hello," + "World!"
Console.WriteLine(str);
```