JAVAC - Java vs C ++

no tags 

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.




hide comments
manjur1996: 2016-06-29 18:58:49

few imp testcases:


sonali9696: 2016-06-21 13:46:49

satisfied all test cases but TLE in C++ :/ are you guys not doing shifting?

lalit_nit: 2016-03-22 18:16:26

Finally :) ...Thanx @Sriharshaa Sammeta

manas0008: 2016-01-20 18:53:30

Don't waste your time in shortening the code..
Just go by the cases in the previous comments...(The above rules of identifiers are not realistic)
there are 5 cases for error.Find them and the problem is solved.
use while(scanf("%s",str)!=EOF) since no. of test cases is not specified.

Sriharshaa Sammeta: 2015-09-28 23:03:08

Some points:
u can use-
// for checking end of input
2) also consider test cases like


sciencepal: 2015-09-15 04:38:08

Thanks to karthik1997 for his test cases. Surely saved me a lot of WAs.

dwij28: 2015-09-10 17:27:52

Checking for consecutive underscores is the key part .. I missed that in my 1st 2 attempts.. Finally AC :)

Anurag Sharma: 2015-08-27 14:52:14

finally got ac... :P
use EOF... caused me so many WA :D

Shivam Singh: 2015-08-20 10:05:54

In addition to the test cases provided, check if
1. first or last character is an _
2. first character is capital
3. there is any consecutive _
print an Error! in any such case

Shubham Sinha: 2015-07-25 14:34:49

The sample test cases do not give you the correct idea of the extent of test cases.
thanks Karthik for test cases :)

Added by:Camilo Andrés Varela León
Time limit:0.157s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: ERL JS NODEJS PERL 6
Resource:Northeastern Europe 2006