Remove comments from a given C/C++ program - GeeksQuiz

Remove comments from a given C/C++ program - GeeksQuiz
Given a C/C++ program, remove comments from it.

The idea is to maintain two flag variables, one to indicate that a single line comment is started, another to indicate that a multiline comment is started. When a flag is set, we look for the end of comment and ignore all characters between start and end.

string removeComments(string prgm)

{

    int n = prgm.length();

    string res;

 

    // Flags to indicate that single line and multpile line comments

    // have started or not.

    bool s_cmt = false;

    bool m_cmt = false;

 

 

    // Traverse the given program

    for (int i=0; i<n; i++)

    {

        // If single line comment flag is on, then check for end of it

        if (s_cmt == true && prgm[i] == '\n')

            s_cmt = false;

 

        // If multiple line comment is on, then check for end of it

        else if  (m_cmt == true && prgm[i] == '*' && prgm[i+1] == '/')

            m_cmt = false,  i++;

 

        // If this character is in a comment, ignore it

        else if (s_cmt || m_cmt)

            continue;

 

        // Check for beginning of comments and set the approproate flags

        else if (prgm[i] == '/' && prgm[i+1] == '/')

            s_cmt = true, i++;

        else if (prgm[i] == '/' && prgm[i+1] == '*')

            m_cmt = true,  i++;

 

        // If current character is a non-comment character, append it to res

        else  res += prgm[i];

    }

    return res;

}

this program is not taking care that if // or /* present inside a defined string, as string s="ghchgc//nbnbnbb"; then it will remove string after //

Finding Comments in Source Code Using Regular Expressions
http://blog.ostermiller.org/find-comment
http://rosettacode.org/wiki/Strip_block_comments#Java

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