JAVAC - Java vs C ++

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Apologists of Java and C++ can argue for hours proving each other that their programming language is the best one. Java people will tell that their programs are clearer and less prone to errors, while C++ people will laugh at their inability to instantiate an array of generics or tell them that their programs are slow and have long source code.

Another issue that Java and C++ people could never agree on is identifier naming. In Java a multiword identifier is constructed in the following manner: the first word is written starting from the small letter, and the following ones are written starting from the capital letter, no separators are used. All other letters are small. Examples of a Java identifier are javaIdentifier, longAndMnemonicIdentifier, name, nEERC.

Unlike them, C++ people use only small letters in their identifiers. To separate words they use underscore character ‘_’. Examples of C++ identifiers are c_identifier, long_and_mnemonic_identifier, name (you see that when there is just one word Java and C++ people agree), n_e_e_r_c.

You are writing a translator that is intended to translate C++ programs to Java and vice versa. Of course, identifiers in the translated program must be formatted due to its language rules — otherwise people will never like your translator.

The first thing you would like to write is an identifier translation routine. Given an identifier, it would detect whether it is Java identifier or C++ identifier and translate it to another dialect. If it is neither, then your routine should report an error. Translation must preserve the order of words and must only change the case of letters and/or add/remove underscores.


The input file consists of several lines that contains an identifier. It consists of letters of the English alphabet and underscores. Its length does not exceed 100.


If the input identifier is Java identifier, output its C++ version. If it is C++ identifier, output its Java version. If it is none, output 'Error!' instead.




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kuchnahiaata: 2018-03-20 07:48:48

be careful about multiple underscores!

Last edit: 2018-03-20 15:12:40
nadstratosfer: 2018-01-02 04:36:33

Got AC with the line checking for illegal chars commented out, so either the input is 100% alnum as stated or you can safely ignore those.

ushould_study: 2018-01-01 10:49:52

AC in one go !
comments helped
1) starting letter should be small
2) underscore at last
3) multiple underscores
remaining conditions are evident from the test cases given.
Kudos! :-)

Last edit: 2018-01-01 10:50:25
anurag31: 2017-10-29 13:02:41

Spoj Toolkit giving WA on n_e_e_r_c

vinhvo: 2017-07-16 13:03:04

Remember '_' as last character !

shauryauppal: 2017-07-10 18:59:21

Remember identifier cannot start with an underscore or start with capital letter, this costed me one wrong answer.

ashwani0605: 2017-06-30 08:54:10

I think there are no numbers in test cases, there are only underscore and alphabets

Last edit: 2017-06-30 10:01:14
prabodh prakash: 2017-05-04 15:50:00

Question could have been formed better about special characters. I got WA because of them.

rohan2802: 2017-03-12 23:30:13

There are no special characters(except underscore) and numbers allowed in the input.If any of them are present it should give error!.These things should be mentioned in the problem or else it wastes a lot of time debugging the code.

nilabja16180: 2017-03-01 12:07:04

2 WA! first letter should be lowercase letter!

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