Question

Let us define a word to be a maximal nonempty sequence of alphanumeric characters and underscores (i.e. matching BRE [[:alnum:]_]\{1,\}). Consider the word to name a variable (function, type, etc.) in a programming language. We say that the word is in camel case if the subwords are introduced with an upper case letter (such as MyVerySpecialVariable). The word can start with an upper case character (UpperCamelCase) or a lower case character (lowerCamelCase). For simplicity, we assume underscores are not present in camel case. Another common naming style is snake case which are in lower case only and subwords are separated with underscores (such as my_very_special_variable, snake_case). Your task is to write two scripts which translate one style to another (camel2snake and snake2camel). In particular the scripts work as filters, i.e. they read the standard input and write to the standard output.

1. Script camel2snake translate all words which are in UpperCamelCase or lowerCamelCase are translated to snake case (words containing underscores are left untouched).

2. On the other hand script snake2camel translate every word in snake case into camel case. Default is UpperCamelCase. If option -l is present, then it translates into lowerCamelCase. Words not in snake case are left untouched (those containing capital characters).

Please help, thank you!

Answer 1

*************************************** Script for Camel To Snake Case *******************************************

script name : Camel2Snake.cpp

====================================== start=======================================

#include<iostream>
#include<string>
#include<cctype>
using namespace std;
string camelToSnake(string input)
{
string r;
char a;
for(int i=0;i<input.length();i++)
{
a=input[i];
if(isupper(a)) if i get a upper case letter then i convert it tp lower case and push '_' before the character in result string
{
a=tolower(a);
if(i!=0) r.push_back('_'); // if first letter is in Upper case then _should not appear at the start of result string
}   
r.push_back(a);
}
return r;
}
int main(int count, char *s[])
{
if(count==1)
{
cout<<"Please enter a valid input "<<endl;
return 0;
}
string k(s[1]);
string l;
l=camelToSnake(k);
cout<<l<<endl;
}

=================================== End =========================================

*************************************** Script for Snake To Camel Case *******************************************

script name : snake2Camel.cpp

:===================================== start=======================================

#include<iostream>
#include<string>
#include<cctype> //for method 'islower','isupper etc'
using namespace std;
string snakeToCamel(string input, bool toLowerCamelCase)
{
string r;
char a;
for(int i=0;i<input.length();i++)
{
a=input[i];
if(toLowerCamelCase==false && i==0) a=toupper(a);  
if(toLowerCamelCase==true && i==0) a=tolower(a);
if(a=='_') // if i found an underscore
{
i++; //increment count i
a=input[i]; //get char at i (after underscore)
if(islower(a)) a=toupper(a); // if that character is in lower case convert it to upper case
}
r.push_back(a); //pushing character into the result string
}
return r;
}

int main(int count, char *s[]) // taking inputs from command line
{

// count stores the number of command line arguments passed and s stores the arguments in char array including script

//name

if(count==1) // if no input string is passed then it will display this message, You can change this message according to you
{
cout<<"Please enter a valid input "<<endl;
return 0;
}
string l;
bool toLowerCamelCase=false;
string g(s[1]);
if(count==3) toLowerCamelCase=true; // if option given then bool variable value is set to true

l=snakeToCamel(g,toLowerCamelCase);
cout<<l<<endl;
return 0;
}

=================================== End =========================================