Add hanoi but in Rust.

2/SAD/hanoi.rs

@@ -0,0 +1,35 @@
+use std::env;
+
+fn print_hanoi(n:i32)
+{
+    if n == 2
+    {
+        println!("1");
+        println!("2");
+        println!("1");
+    }
+    else
+    {
+        print_hanoi(n-1);
+        println!("{}", n);
+        print_hanoi(n-1);
+    }
+}
+
+fn main()
+{
+    let args:Vec<String> = env::args().collect();
+    if args.len() != 2
+    {
+        println!("Need a number!");
+        std::process::exit(1);
+    }
+    let n:i32 = args[1].parse().unwrap();
+    if n < 2
+    {
+        println!("Need a number greater than 1!");
+        std::process::exit(1);
+    }
+
+    print_hanoi(n);
+}