Data commit

Task/Middle-three-digits/Rust/middle-three-digits.rust

@@ -0,0 +1,30 @@
+fn middle_three_digits(x: i32) -> Result<String, String> {
+    let s: String = x.abs().to_string();
+    let len = s.len();
+    if len < 3 {
+        Err("Too short".into())
+    } else if len % 2 == 0 {
+        Err("Even number of digits".into())
+    } else {
+        Ok(s[len/2 - 1 .. len/2 + 2].to_owned())
+    }
+}
+
+fn print_result(x: i32) {
+    print!("middle_three_digits({}) returned: ", x);
+    match middle_three_digits(x) {
+        Ok(s) => println!("Success, {}", s),
+        Err(s) => println!("Failure, {}", s)
+    }
+}
+
+fn main() {
+    let passing = [123, 12345, 1234567, 987654321, 10001, -10001, -123, -100, 100, -12345];
+    let failing = [1, 2, -1, -10, 2002, -2002, 0];
+    for i in passing.iter() {
+        print_result(*i);
+    }
+    for i in failing.iter() {
+        print_result(*i);
+    }
+}