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stringrustchar

Why is the last character from user input not correct?

I am trying to get the last value of a string from user input. I tried implementing it but it does not give the expected output:

println!("Please input temp (ex: 60F): ");
let mut temp = String::new();
io::stdin()
    .read_line(&mut temp)
    .expect("Failed to read line");
println!("{temp}");
let unit = temp.chars().last().unwrap();
println!("unit: {}", unit);

> Please input temp (ex: 60F): 
60f
unit:

I would've expected the last line to look something like:

unit: f

I tried multiple solutions from StackOverflow and reddit but it did not work as well.

Solution

  • Your string contains the \n inputted by the user. try this

    let unit = temp.trim().chars().last().unwrap();