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use std::io::{self, Write};
 
// 逆ポーランド記法を計算する関数
fn calc_rpn(text: &str) -> f64 {
    // 計算用のスタックを初期化
    let mut stack: Vec<f64> = vec![];
    // 逆ポーランド記法の式をスペースで区切る
    let tokens = text.split(' ');
    // スペースで区切られたトークンを一つづつ処理
    for tok in tokens {
        // 空ならば無視する
        let tok = tok.trim();
        if tok.len() == 0 { continue; }
        // 数値変換を試みる
        match tok.parse::<f64>() {
            // 変換成功ならスタックに追加
            Ok(num) => {
                stack.push(num);
                continue;
            },
            // 失敗なら演算子
            Err(_) => {}
        };
        // 演算子ならスタックから2つ値を得る
        let b = stack.pop().unwrap_or(0.0);
        let a = stack.pop().unwrap_or(0.0);
        // 計算結果をスタックに追加
        match tok {
            "+" => stack.push(a + b),
            "-" => stack.push(a - b),
            "*" => stack.push(a * b),
            "/" => stack.push(a / b),
            "%" => stack.push(a % b),
            _ => { println!("[ERROR] {}", tok); }
        }
    }
    // 最後にスタックに残っている値が計算結果
    stack.pop().unwrap_or(0.0)
}
 
fn main() {
    loop {
        print!(">>> ");
        io::stdout()
            .flush()
            .expect("プロンプトのフラッシュに失敗hしました");
        let mut expr = String::new();
        io::stdin()
            .read_line(&mut expr)
            .expect("行の読み込みに失敗しました");
        let expr = expr.trim();
        if expr.eq_ignore_ascii_case("q") {
            break;
        }
        println!("{} = {}", expr, calc_rpn(&expr));
    }
}

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Runtime error #stdin #stdout 0.05s 5284KB

stdin

Standard input is empty

stdout

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>>>  =

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