User input

Here is an example of how to take user input in a Rust program:

  use std::io;
  
  fn main() {
      let mut input = String::new();
  
      io::stdin().read_line(&mut input).expect("Failed to read line");
  
      println!("The user input is: {}", input);
  }

In this example, the read_line() function from the std::io module is used to read a line of user input. The read_line() function takes a mutable string as an argument, and it returns an io::Result. The io::Result enum represents the result of an I/O operation, and it can either be Ok or Err.

If the read_line() function succeeds, it returns Ok(input), where input is the string that was entered by the user. If the read_line() function fails, it returns Err(error), where error is an error message.

The expect() macro is used to handle the io::Result from the read_line() function. The expect() macro takes a Result as an argument, and it panics if the Result is Err. In this example, the expect() macro will panic if the read_line() function fails.

The main() function prints the user input to the console.

Here is an example of how to run the program:

Code snippet

cargo run

When you run the program, you will be prompted to enter some text. After you enter the text, the program will print the text that you entered to the console.

To capture user input in a Rust program, you can use the std::io module to read input from the standard input stream (stdin). Here's an example that demonstrates how to get user input in Rust:

use std::io;

fn main() {
    println!("Please enter your name:");

    let mut name = String::new();
    io::stdin()
        .read_line(&mut name)
        .expect("Failed to read line");

    println!("Hello, {}!", name.trim());
}

In this example, the program prompts the user to enter their name. It creates a mutable String variable called name to store the input. The read_line function from std::io::stdin() reads the input from the user and appends it to the name variable. The expect method is used to handle any errors that may occur during input reading.

Finally, the program trims the input using the trim method to remove any leading or trailing whitespace. It then prints a greeting message along with the user's name.

You can run this program and interact with it by providing your name as input.