Add file from the lecture

materialien/read.rs

@@ -0,0 +1,28 @@
+use std::str::FromStr;
+use std::fmt::Display;
+
+fn main() {
+    // let x = read::<usize>();
+    let x: usize = read();
+    println!("{}", x);
+
+}
+
+fn read<T>() -> T
+    where T: FromStr,
+          T::Err: Display
+{
+    use std::io;
+
+    loop {
+        let mut s = String::new();
+        io::stdin()
+            .read_line(&mut s)
+            .expect("unexpected io error");
+
+        match s.trim_right().parse() {
+            Ok(value) => return value,
+            Err(e) => println!("error: {}", e),
+        }
+    }
+}