40 lines
600 B
Rust
40 lines
600 B
Rust
use std::env;
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#[derive(Debug)]
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enum Maybe<T> {
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Just(T),
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Nothing
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}
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fn main() {
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let arg = env::args().nth(1);
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println!("{:?}", Maybe::Just(42));
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match arg {
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Some(result) => {
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let ip = ip_to_int(&result);
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println!("{:b}", ip);
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},
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None => println!("need one arg")
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}
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}
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fn ip_to_int(ip_str: &str) -> u32 {
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let mut tbl : Vec<&str> = ip_str.split(".")
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.collect();
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tbl.reverse();
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let mut ip = 0_u32;
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for (idx, s) in tbl.iter().enumerate() {
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let nbr : u8 = s.parse()
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.expect("parse fail");
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ip += (nbr as u32) << 8*idx;
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}
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ip
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}
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