package com.helong.test;import java.util.Scanner;public class Literals {public static void main(String[] args) {Scanner input = new Scanner(System.in);println("请选择您要操作项的编号：");println("1.十进制转二进制\t\t\t2.二进制转十进制");while (!input.hasNextInt()) {println("您输入的不是整型，请输入0-9的数字");input.nextLine();}Scanner input1 = new Scanner(System.in);switch (input.nextInt()) {case 1:println("\t\t\t\t您选择的是：1.十进制转二进制");println("请输入你要转换的二进制数:");int a = 0;a = input1.nextInt();println("您输入的十进制数是：" + a + " 转换成二进制是：" + convertBinary(a));break;case 2:println("\t\t\t\t您选择的是：2.二进制转十进制");println("请输入你要转换的二进制数:");String b = input1.nextLine();println("您输入的二进制数是：" + b + " 转换成十进制数是："+ convertAlgorism(b.toCharArray()));break;default:println("您输入的操作编号系统不能识别，系统将自动停止");}input.close();}// 十进制转换二进制private static String convertBinary(int sum) {StringBuffer binary = new StringBuffer();while (sum != 0 && sum != 1) {binary.insert(0, sum % 2);println("sum=" + sum + "余数=" + (sum % 2) + "除数=" + sum / 2);sum = sum / 2;if (sum == 0 || sum == 1) {binary.insert(0, sum % 2);}}return binary.toString();}// 二进制转十进制private static int convertAlgorism(char[] cars) {int result = 0;int num = 0;for (int i = cars.length - 1; 0 <= i; i--) {int temp = 2;if (num == 0) {temp = 1;} else if (num == 1) {temp = 2;} else {for (int j = 1; j < num; j++) {temp = temp * 2;}}int sum = Integer.parseInt(String.valueOf(cars[i]));result = result + (sum * temp);num++;}return result;}private static void println(Object info) {System.out.println(info);}private static void print(Object info) {System.out.print(info);}
}