find the size of a csv file in rust

To find the size of a CSV file in Rust, we can use the std::fs module to get the metadata of the file, then extract the size from the metadata. Here is an example implementation:

main.rs
use std::fs;

fn main() -> std::io::Result<()> {
    let file_path = "example.csv"; // replace with your CSV file path
    let file_metadata = fs::metadata(file_path)?;
    let file_size = file_metadata.len(); // size is returned in bytes
    
    println!("Size of file {}: {} bytes", file_path, file_size);
    Ok(())
}
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In this example, we first define the path to our CSV file, and then use the fs::metadata() function to get the metadata of the file at that path. This returns a std::fs::Metadata struct, which contains information about the file, including its size.

We then extract the size by calling the len() method of the Metadata struct, which returns the size of the file in bytes.

Finally, we print the size of the file to the console. Note that we use the ? operator to propagate any errors that may occur when reading the file metadata.