Macro lab_grader::prompt

macro_rules! prompt {
    ( $msg:expr, $type:ty ) => { ... };
}

Calls prompt, then tries to parse the input into the provided type. If parsing fails, it will print an error message and then quit the current process.

This method trims whitespace on the beginning and end of the input string.

If you wish to deal with the error yourself instead of quitting, then call prompt, then parse yourself.

Example

#[macro_use] extern crate lab_grader;
use lab_grader::helpers;

fn main() {
    let string = prompt!("Enter a string: ", String);
    println!("{}", string);

    let number = prompt!("Enter a number: ", u32);
    println!("{}", number);

    let another = prompt!("Enter another number: ", u32);
    println!("{}", another);
}

They input:

Enter a string: Here's a string
Here's a string
Enter a number: 123
123
Enter another number: not a number
Could not parse input