Java蓝桥杯试题集——算法训练ALGO-92——前缀表达式

题目要求

解题思路

这个题一个switch解决~

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner in = new Scanner(System.in);
		String x = in.next();
		int a = in.nextInt();
		int b = in.nextInt();
		switch (x) {
		case "+":
			System.out.println(a+b);
			break;
		case "-":
			System.out.println(a-b);
			break;
		case "*":
			System.out.println(a*b);
			break;
		case "/":
			System.out.println(a/b);
			break;

		default:
			break;
		}
	}

}