How do you work with files in Rust?

Question

Accepted Answer

**std::fs** for file operations.

**Read file:**
```rust
use std::fs;

// Read entire file
let content = fs::read_to_string("file.txt")?;

// Read as bytes
let bytes = fs::read("file.txt")?;
```

**Write file:**
```rust
fs::write("output.txt", "Hello, world!")?;
```

**Using File API:**
```rust
use std::fs::File;
use std::io::{Read, Write, BufRead, BufReader};

// Read with buffer
let file = File::open("file.txt")?;
let reader = BufReader::new(file);
for line in reader.lines() {
    println!("{}", line?);
}

// Write
let mut file = File::create("output.txt")?;
file.write_all(b"Hello!")?;
```

**Key:** fs for simple, File for streaming.

Rust: How do you work with files in Rust?