历届试题 小计算器

代码展示（java版）

思路分析：

• 根据指令，转换当前进制，任意进制的转换java有直接的api调用即可
• 定义基数num，如果是第一个数将输入的数字赋值给基数，方便后面运算
• 遇到初始化则将当前基数制令

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws NumberFormatException, IOException {
		BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
		while(bufferedReader.ready()) {
			int n = Integer.parseInt(bufferedReader.readLine());
			long num = 0;
			int calcFlag = 1, dec = 10;
			for (int i=1; i<=n; i++) {
				String inst = bufferedReader.readLine();
				if(inst.contains("NUM")) {
					String[] x = inst.split(" ");
					String numstr = x[1];
					long temp = Long.valueOf(numstr, dec);
					switch (calcFlag) {
						case 1:
							 num += temp;
							break;
						case 2:
							num -= temp;
							break;
						case 3:
							num *= temp;
							break;
						case 4:
							num /= temp;
							break;
						case 5:
							num %= temp;
							break;
						case 0:
							num = temp;
						default:
							break;
					}
				} else if(inst.contains("ADD")){
					calcFlag = 1;
				} else if(inst.contains("SUB")){
					calcFlag = 2;
				} else if(inst.contains("MUL")){
					calcFlag = 3;
				} else if(inst.contains("DIV")){
					calcFlag = 4;
				} else if(inst.contains("MOD")){
					calcFlag = 5;
				} else if(inst.contains("CLEAR")){
					num = 0;
					calcFlag = 0;
				} else if(inst.contains("CHANGE")){
					String[] x = inst.split(" ");
					dec = Integer.parseInt(x[1]);
				} else if(inst.contains("EQUAL")){
					String res = Long.toString(num, dec).toUpperCase();
					System.out.println(res);
				}
			}
		}
		bufferedReader.close();
	}
}

标签：java,试题,int,BufferedReader,bufferedReader,io,计算器,import,历届
来源： https://blog.csdn.net/qq_40789105/article/details/88760945