百度之星

百度之星

描述在百度之星的贴吧里面，Java的爱好者和C++的爱好者总是能为这两种语言哪个更好争论上几个小时。Java的爱好者会说他们的程序更加整洁且不易出错。C++的爱好者则会嘲笑Java程序很慢而且代码很长。 另一个Java和C++爱好者不能达成一致的争论点就是命名问题。在Java中一个多个单词构成的变量名应该按照如下格式命名：第一个单词的开头用小写字母，其余单词都以大写字母开头，单词与单词之间不加分隔符，除单词的首字母之外的字母一律使用小写。例如：javaIdentifier, longAndMnemonicIdentifier, name, bAIDU. 与Java不同C++的命名全都使用小写字母，在单词和单词之间使用“_”来作为分隔符。例如：c_identifier,long_and_mnemonic_identifier, name (当名字中只有一个单词的时候，Java与C++的命名是相同的), b_a_i_d_u. 你的任务就是写一个程序能让C++和Java程序相互转化。当然转换完成的程序中的变量名也要符合其语言的命名规则，否则的话是不会有人喜欢你的转换器的。 首先你要做的就是写一个变量名转换器。给出一个变量名，你要先检测是Java的还是C++的，然后把它转化为另一种命名格式。如果两种都不是，那么你的程序就要报错。转换过程必须保持原有的单词顺序，只能改变字母的大小写和增加或删除下划线。

输入输入有且仅有一行，是一个变量名，其中包含字母和下划线，长度不超过100。

输出如果输入的是Java变量名那么输出它对应的C++形式。如果是C++的则输出对应的Java的形式。如果两种都不是就输出“Error!”。

样例输入输入样例1： long_and_mnemonic_identifier 输入样例2： anotherExample 输入样例3： i 输入样例4： bad_Style

样例输出输出样例1： longAndMnemonicIdentifier 输出样例2： another_example 输出样例3： i 输出样例4： Error!

import java.util.Scanner; public class Main {public static void main(String[] args) {Scanner scan = new Scanner(System.in);String[] outStr = new String[200];int i = 0;outStr[i] = scan.next();if (outStr[i].substring(0, 1).equals("_")|| outStr[i].substring(0, 1).matches("[A-Z]")|| outStr[i].contains("___")|| outStr[i].contains("____")|| outStr[i].contains("__")|| outStr[i].substring(outStr[i].length() - 1,outStr[i].length()).equals("_")|| (outStr[i].contains("_") && (outStr[i].contains("A")|| outStr[i].contains("B") || outStr[i].contains("C")|| outStr[i].contains("D") || outStr[i].contains("E")|| outStr[i].contains("F") || outStr[i].contains("G")|| outStr[i].contains("H") || outStr[i].contains("I")|| outStr[i].contains("J") || outStr[i].contains("K")|| outStr[i].contains("L") || outStr[i].contains("M")|| outStr[i].contains("N") || outStr[i].contains("O")|| outStr[i].contains("P") || outStr[i].contains("Q")|| outStr[i].contains("R") || outStr[i].contains("S")|| outStr[i].contains("T") || outStr[i].contains("U")|| outStr[i].contains("V") || outStr[i].contains("W")|| outStr[i].contains("X") || outStr[i].contains("Y") || outStr[i].contains("Z")))) {System.out.println("Error!");}else if (outStr[i].contains("_")) {// int index = str.indexOf("_");//// outStr[i] = str.substring(0, index);//// str = str.substring(index + 1);//// outStr[i] = outStr[i] + str.substring(0, 1).toUpperCase()// + str.substring(1);if (outStr[i] != null) {while (outStr[i].contains("_")) {// if (outStr[i].contains("_")) {int index = outStr[i].indexOf("_");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index + 1);outStr[i] = outStr[i]+ outStr[i - 1].substring(0, 1).toUpperCase()+ outStr[i - 1].substring(1);// }}System.out.println(outStr[i]);}}else if (outStr[i].contains("A") || outStr[i].contains("B")|| outStr[i].contains("C") || outStr[i].contains("D")|| outStr[i].contains("E") || outStr[i].contains("F")|| outStr[i].contains("G") || outStr[i].contains("H")|| outStr[i].contains("I") || outStr[i].contains("J")|| outStr[i].contains("K") || outStr[i].contains("L")|| outStr[i].contains("M") || outStr[i].contains("N")|| outStr[i].contains("O") || outStr[i].contains("P")|| outStr[i].contains("Q") || outStr[i].contains("R")|| outStr[i].contains("S") || outStr[i].contains("T")|| outStr[i].contains("U") || outStr[i].contains("V")|| outStr[i].contains("W") || outStr[i].contains("X")|| outStr[i].contains("Y") || outStr[i].contains("Z")) {// String[] outStr = new String[100];// int i = 0;//// int index = outStr[i].indexOf("A");// outStr[i] = outStr[i].substring(0, index);// outStr[i] = outStr[i].substring(index);// outStr[i] = outStr[i] + "_" + outStr[i].substring(0,// 1).toLowerCase()// + outStr[i].substring(1);// System.out.println(outStr[i]);if (outStr[i] != null) {while (outStr[i].contains("A")) {int index = outStr[i].indexOf("A");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}// index = str.indexOf("B");// outStr[i] = str.substring(0, index);// str = str.substring(index);// outStr[i] = outStr[i] + "_" + str.substring(0, 1).toLowerCase()// + str.substring(1);// System.out.println(outStr[i]);if (outStr[i] != null) {while (outStr[i].contains("B")) {int index = outStr[i].indexOf("B");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("C")) {int index = outStr[i].indexOf("C");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("D")) {int index = outStr[i].indexOf("D");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("E")) {int index = outStr[i].indexOf("E");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("F")) {int index = outStr[i].indexOf("F");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("G")) {int index = outStr[i].indexOf("G");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("H")) {int index = outStr[i].indexOf("H");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("I")) {int index = outStr[i].indexOf("I");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("J")) {int index = outStr[i].indexOf("J");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("K")) {int index = outStr[i].indexOf("K");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("L")) {int index = outStr[i].indexOf("L");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("M")) {int index = outStr[i].indexOf("M");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("N")) {int index = outStr[i].indexOf("N");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("O")) {int index = outStr[i].indexOf("O");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("P")) {int index = outStr[i].indexOf("P");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("Q")) {int index = outStr[i].indexOf("Q");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("R")) {int index = outStr[i].indexOf("R");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("S")) {int index = outStr[i].indexOf("S");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("T")) {int index = outStr[i].indexOf("T");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("U")) {int index = outStr[i].indexOf("U");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("V")) {int index = outStr[i].indexOf("V");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("W")) {int index = outStr[i].indexOf("W");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("X")) {int index = outStr[i].indexOf("X");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("Y")) {int index = outStr[i].indexOf("Y");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}if (outStr[i] != null) {while (outStr[i].contains("Z")) {int index = outStr[i].indexOf("Z");i++;outStr[i] = outStr[i - 1].substring(0, index);outStr[i - 1] = outStr[i - 1].substring(index);outStr[i] = outStr[i] + "_"+ outStr[i - 1].substring(0, 1).toLowerCase()+ outStr[i - 1].substring(1);}}System.out.println(outStr[i]);}elseSystem.out.println(outStr[i]);} }

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