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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matematikaadit: 2015-03-31 05:10:17

@(Tjandra Satria Gunawan)(曾毅昆)
First solver in SED language ^_^
This problem is also very good to implement in SED.

qwerty: 2015-03-28 15:59:20

What about an underscore at the end ?? is it valid c++ identifier or an Error ?

Sapan tanted: 2015-03-27 18:09:53

how many test cases ?

re(vamsi): read till EOF. check the documentation of language you use if you don't know how to.

Last edit: 2015-03-27 19:14:10
Daniel Carvalho: 2015-03-06 12:54:13

This problem doesn't follow C++'s naming directives, so assume it's a C++-like language, and generate errors when they shouldn't be generated.

abhijeet: 2015-02-24 15:21:52

partial construction of automata gave so many errors :)

Akshit Johry: 2015-02-20 23:05:12

how do we decide upon the no. of test cases?

Last edit: 2015-02-20 23:05:22
(Tjandra Satria Gunawan)(曾毅昆): 2013-08-16 04:35:14

First solver in AWK language :-) This problem is very good to implement the power of RegEx processing in AWK.. Suprisingly until now (since 2006) this problem has 2500+ solver and no one solve this using AWK that has powerful RegEx :-O

Smithers: 2009-08-06 01:15:14

Bonus challenge: solve this in both Java and C/C++.
Extra bonus challenge: do this as a polyglot (the same file will compile and run (and get AC) in both languages).

Added by:Camilo Andrés Varela León
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: ERL JS-RHINO NODEJS PERL6 VB.NET
Resource:Northeastern Europe 2006