口算练习题（洛谷P1957题题解，Java语言描述）

题目要求

P1957题目链接

分析

对指令做个存储，组合成串之后，获取一下长度，就完了。

AC代码（Java语言描述）

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int num = Integer.parseInt(scanner.nextLine());
        String character = "";
        for (int i = 0; i < num; i++) {
            String line = scanner.nextLine(), result = "";
            String[] array = line.split("\\s+");
            int a, b;
            if (line.startsWith("a")) {
                character = "a";
                a = Integer.parseInt(array[1]);
                b = Integer.parseInt(array[2]);
            } else if (line.startsWith("b")) {
                character = "b";
                a = Integer.parseInt(array[1]);
                b = Integer.parseInt(array[2]);
            } else if (line.startsWith("c")) {
                character = "c";
                a = Integer.parseInt(array[1]);
                b = Integer.parseInt(array[2]);
            } else {
                a = Integer.parseInt(array[0]);
                b = Integer.parseInt(array[1]);
            }
            switch (character) {
                case "a":
                    result = a + "+" + b + "=" + (a+b);
                    break;
                case "b":
                    result = a + "-" + b + "=" + (a-b);
                    break;
                case "c" :
                    result = a + "*" + b + "=" + (a*b);
                    break;
            }
            System.out.println(result + "\n" + result.length());
        }
        scanner.close();
    }
}