RPN（逆波兰表示法）计算器

逆波兰表示法（RPN）计算器。

示例

fn main() {
    let src = String::from("1 2 + 3 * ");
    let a = hkkim_lib_wikibooks_rpn_test::eval(src).unwrap();
    println!("{}", a); // →9
}

fn main() {
    let result = hkkim_lib_wikibooks_rpn_test::eval_str("1 2 3 * +");
    println!("{}", result); // →7
}

use hkkim_lib_wikibooks_rpn_test as rpn_calc;

fn main() {
    let src = "2 3 4 * +".to_string();
    let ans = rpn_calc::eval(src).unwrap();
    println!("{}", ans);
}

lib.rs:

RPN计算器

逆波兰表示法（RPN）计算器。

示例1

let src = String::from("1 2 + 3 * ");
let a = hkkim_lib_wikibooks_rpn_test::eval(src).unwrap();
println!("{}", a); // →9

示例2

use hkkim_lib_wikibooks_rpn_test as rpn_calc;
let src = "2 3 4 * +".to_string();
let ans = rpn_calc::eval(src).unwrap();
println!("{}", ans);