scanln

The inverse of println

Overview

scanln is a macro that reads a line from stdin, removes the trailing newline (if present), and leaves other trailing whitespace intact. It expands to an expression that returns a String, so it can be assigned to a variable or used directly. The arguments to scanln are exactly the same as those to the print macro and can be used to generate a prompt.

Examples

scanln is very simple to use:

let input = scanln!("> ");

This results in a prompt that looks like this (where _ is the cursor):

> _

When the user presses enter, a String containing their input will be stored in input.

There are more examples demonstrating usage in the examples directory, which can be run with cargo.