Here are simple examples of the "Hello World" program, which is commonly used as a basic introduction to programming in various languages, in C++, C#, Java, and Python:

# C++

```cpp
#include <iostream>

int main() {
    std::cout << "Hello World!" << std::endl;
    return 0;
}
```

# C#

```csharp
using System;

class Program {
    static void Main() {
        Console.WriteLine("Hello World!");
    }
}
```

# Java

```java
public class HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hello World!");
    }
}
```

# Python

```python
print("Hello World!")
```
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