ユークリッドの互除法
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extern crate rand; | |
use rand::Rng; | |
fn main() { | |
let (a, b) = (rand::thread_rng().gen_range(1, 999999999), rand::thread_rng().gen_range(1, 999999999)); | |
println!("gcd {}", gcd(&a, &b)); // ランダムに生成した数値の最大公約数 | |
println!("gcd {}", gcd(&1071, &1029)); // 1071, 1029 の最大公約数 21 | |
} | |
fn gcd(a: &i32, b: &i32) -> i32 { | |
println!("a: {}, b: {}", a, b); // 初期値 | |
let (mut a , mut b) = if a > b { (*a, *b) } else { (*b, *a) }; | |
let mut r: i32 = a % b; | |
while r != 0 { | |
println!("a: {}, b: {}, r: {}", a, b, r); // 途中の計算結果 | |
a = b; | |
b = r; | |
r = a % b; | |
}; | |
b | |
} |
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