题目描述
Jessi初学英语，为了快速读出一串数字，编写程序将数字转换成英文：
如22：twenty two，123：one hundred and twenty three。
说明：
数字为正整数，长度不超过九位，不考虑小数，转化结果为英文小写；
输出格式为twenty two；
非法数据请返回“error”；
关键字提示：and，billion，million，thousand，hundred。
方法原型：public static String parse(long num)
输入描述:
输入一个long型整数
输出描述:
输出相应的英文写法
示例1
输入
2356
输出
two thousand three hundred and fifty six
代码如下：
package com.yzh.hehe;
import java.util.Scanner;
public class NumberToEnglish {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner scanner=new Scanner(System.in);
while (scanner.hasNext()) {
long num=scanner.nextLong();
System.out.println(parse(num));
}
scanner.close();
}
public static String parse(long num){
String[] geweiArr={"one","two","three","four","five","six","seven","eight","nine" };
String[] shiweiArr={"twenty","thirty","forty","fifty","sixty","seventy","eighty","ninety"};
String[] shiduoArr={"ten","eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen","eighteen","nineteen"};
String numString=String.valueOf(num);
// 要求最多不超过九位数，不够九位的前面填0
for (int i = numString.length(); i <9; i++) {
numString="0"+numString;
}
StringBuilder stringBuilder=new StringBuilder();
String million=numString.substring(0,3);//以1000（thousand）每三位为一个部分（个十百）来处理
int miBaiInt=Integer.parseInt(million.substring(0, 1));
boolean flag=false;//判断是否加and的标志
//处理三位组成的数当中的百位
if (miBaiInt!=0) {
flag=true;
stringBuilder.append(geweiArr[miBaiInt-1]+" hundred");
}
int miShiInt=Integer.parseInt(million.substring(1,2));//三位组成的数当中的十位
int migeInt=Integer.parseInt(million.substring(2));//三位组成的数当中的个位
if ((miShiInt!=0||migeInt!=0)&&flag) {
stringBuilder.append(" and ");
}
//十位为1时十位和个位可同时处理，否则，先处理十位，在处理个位
if (miShiInt==1) {
int temp=Integer.parseInt(million.substring(1));//十位个位同事处理
stringBuilder.append(shiduoArr[temp-10]);
}
//十位，个位分别处理
else {
flag=false;
if(miShiInt!=0){
flag=true;
stringBuilder.append(shiweiArr[miShiInt-2]);
}
if (flag&&migeInt!=0) {
stringBuilder.append(" "+geweiArr[migeInt-1]);
}else if(migeInt!=0){
stringBuilder.append(geweiArr[migeInt-1]);
}
}
int length=stringBuilder.length();//判断是否存在million和thousand
if (length!=0) {
stringBuilder.append(" million ");
}
String thousand=numString.substring(3,6);//处理第二个三位组成的部分
int thBaiInt=Integer.parseInt(thousand.substring(0,1));
flag=false;
if (thBaiInt!=0) {
flag=true;
stringBuilder.append(geweiArr[thBaiInt-1]+" hundred");
}
int thShiInt=Integer.parseInt(thousand.substring(1,2));
int thGeInt=Integer.parseInt(thousand.substring(2));
if (flag&&(thShiInt!=0||thGeInt!=0)) {
stringBuilder.append(" and ");
}
if (thShiInt==1) {
int temp=Integer.parseInt(thousand.substring(1));
stringBuilder.append(shiduoArr[temp-10]);
}else {
flag=false;
if (thShiInt!=0) {
flag=true;
stringBuilder.append(shiweiArr[thShiInt-2]);
}
if (flag&&thGeInt!=0) {
stringBuilder.append(" "+geweiArr[thGeInt-1]);
}else if (thGeInt!=0) {
stringBuilder.append(geweiArr[thGeInt-1]);
}
}
if (stringBuilder.length()>length) {
stringBuilder.append(" thousand ");
}
String bsg=numString.substring(6);//处理第三个三位组成的部分
int bsgBaiInt=Integer.parseInt(bsg.substring(0,1));
flag=false;
if (bsgBaiInt!=0) {
flag=true;
stringBuilder.append(geweiArr[bsgBaiInt-1]+" hundred");
}
int bsgShiInt=Integer.parseInt(bsg.substring(1,2));
int bsgGeInt=Integer.parseInt(bsg.substring(2));
if (flag&&(bsgShiInt!=0||bsgGeInt!=0)) {
stringBuilder.append(" and ");
}
if (bsgShiInt==1) {
int temp=Integer.parseInt(bsg.substring(1));
stringBuilder.append(shiduoArr[temp-10]);
}else {
flag=false;
if (bsgShiInt!=0) {
flag=true;
stringBuilder.append(shiweiArr[bsgShiInt-2]);
}
if (flag&&(bsgGeInt!=0)) {
stringBuilder.append(" "+geweiArr[bsgGeInt-1]);
}else if (bsgGeInt!=0) {
stringBuilder.append(geweiArr[bsgGeInt-1]);
}
}
return stringBuilder.toString();
}
}