September Morn Update

Task/Trabb-Pardo-Knuth-algorithm/Rust/trabb-pardo-knuth-algorithm.rust

@@ -0,0 +1,30 @@
+use std::io::{self, BufRead};
+
+fn op(x: f32) -> Option<f32> {
+    let y = x.abs().sqrt() + 5.0 * x * x * x;
+    if y < 400.0 {
+        Some(y)
+    } else {
+        None
+    }
+}
+
+fn main() {
+    println!("Please enter 11 numbers (one number per line)");
+    let stdin = io::stdin();
+
+    let xs = stdin
+        .lock()
+        .lines()
+        .map(|ox| ox.unwrap().trim().to_string())
+        .flat_map(|s| str::parse::<f32>(&s))
+        .take(11)
+        .collect::<Vec<_>>();
+
+    for x in xs.into_iter().rev() {
+        match op(x) {
+            Some(y) => println!("{}", y),
+            None => println!("overflow"),
+        };
+    }
+}