made numeralise runnable

Author: roppa

roman-numerals/Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "roman-numerals"
+name = "roman_numerals"
 version = "0.1.0"
 authors = ["Mark Robson <[email protected]>"]
 edition = "2018"

roman-numerals/src/lib.rs

@@ -193,7 +193,10 @@ mod tests {
     }
 }
 
-fn numeralise(number: u32) -> String {
+pub fn numeralise(number: i32) -> String {
+  if number > 3999 {
+    panic!("number must be below 4000");
+  }
   let mut numeral = String::from("");
   let mut counter = number;
   while counter > 0 {

roman-numerals/src/main.rs

@@ -1,3 +1,7 @@
+use std::env::args;
+use roman_numerals::numeralise;
+
 fn main() {
-    println!("Hello, world!");
+    let args: Vec<String> = args().skip(1).collect();
+    println!("{:?}", numeralise(args[0].parse::<i32>().unwrap()));
 }