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@rwaldron /isprime.rs
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// Rough port of https://gist.github.com/1412787
use std;
use euler;
import std::io::println;
fn result(arg: str, b: bool) -> str {
let msg = "";
if b {
msg = #fmt("%s is prime", arg);
}
else {
msg = #fmt("%s is not prime", arg);
}
msg
}
fn main(args: [str]) {
// TODO: Find out why
// in the mean time, do this icky dance to check for args
let x = -1;
for arg in args {
x += 1;
}
// why not? if str::is_empty(args[1]) {
if x == 0 {
for i in [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 11197 ] {
println(
result( int::str(i), euler::is_prime(i) )
);
}
}
else {
let num = int::from_str(args[1]);
println(
result( args[1], euler::is_prime(num) )
);
}
}
// compile and run:
// rustc isprime.rs -L . && ./isprime && ./isprime 9450031 && ./isprime 104743
// 2 is prime
// 3 is prime
// 5 is prime
// 7 is prime
// 11197 is prime
// 9450031 is not prime
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