get avarage of the number argumants

echo_avg.rs

use std::{os};

fn args_avg(vec: &[~str]) -> int {
	let mut sum = 0;
	let mut count = 0;
	for i in vec.iter(){
		let x:Option<int> = from_str(*i);
		if x != None{
			sum += x.unwrap();
			count += 1;
		}
	}
	if count > 0 {
		return (sum/count) ;	
	}
	return 0;
}

fn catch_bad_args(vec:&[~str]) -> (){
	print!("Bad args: ")
	for i in vec.iter(){
		let x:Option<int> = from_str(*i);
		if x == None {
			print!("{}", *i);
		} 
	}
	println!("");
}

fn main(){
	let user_args = os::args();
	let args_vec = user_args.slice(1, user_args.len());
	for user_arg in args_vec.iter(){
		print!("{} ", *user_arg);
	} 
	println("");

	catch_bad_args(args_vec);
	println!("Avarage: {:?}",args_avg(args_vec));
	
}