How can you declare and initialize a string variable in C++?

In C++, you can declare and initialize a string variable using the std::string class. Here are a few ways to do it:

Direct Initialization:
```
std::string myString = "Hello, World!";
```

Using the Assignment Operator:

std::string myString;
myString = "Hello, World!";

Using the Constructor:
```
std::string myString("Hello, World!");
```

Empty String Initialization:

std::string emptyString; // Initializes an empty string

Example Code:

#include <iostream>
#include <string>

int main() {
    std::string greeting = "Hello, World!";
    std::string name;
    name = "John Doe";
    
    std::cout << greeting << std::endl;
    std::cout << name << std::endl;

    return 0;
}

In this example, greeting is initialized directly, while name is declared first and then assigned a value. This demonstrates the flexibility in declaring and initializing string variables in C++. If you have any questions or need further clarification, feel free to ask!