Implement a method called printNonComments() which prints out a extract of text with comments removed.

For example, the input:

hello /* this is a
multi line comment */ all

Should produce:

hello
all

You have access to a method called getNextLine() which returns the next line in the input string.

Question

Implement a method called printNonComments() which prints out a extract of text with comments removed.

For example, the input:

hello /* this is a 
multi line comment */ all

Should produce:

hello
all

You have access to a method called getNextLine() which returns the next line in the input string.

C++ Using istringstream · Accepted Answer

//need to use  and also "/*" and "*/" need to be followed by space " ".
int main()
{
    string s = "hello /* this is a multi line comment */ all ";
    istringstream iss(s);
    string tmp;
    while(iss>>tmp){
        if(tmp=="/*"){
            while(iss>>tmp){
                if(tmp=="*/"){
                    iss>>tmp;
                    break;
                }
            }

        }
        cout<

MaiaZ · Answer

def echo(what):
    sys.stdout.write(what)

def gobble(what):
    pass

funsrc = cycle([(echo, "/*"), (gobble, "*/")])

consumer_fun, delim = funsrc.next()
while True:
    line = getNextLine()
    if not line:
        break
    ix = line.find(delim)
    while ix >= 0:
        prefix = line[:ix]
        line = line[ix+len(delim):]
        consumer_fun(prefix)
        consumer_fun, delim = funsrc.next()
        ix = line.find(delim)
    consumer_fun(line)

Ian Park · Answer

With vector instead of the getNextLine() to make test easier.

using namespace std;
void printNonComment(const vector& v) {
    bool show = true;
    for(vector::const_iterator itr = v.begin(); itr != v.end(); ++itr) {
        string s = *itr;
        for(int i = 0 ; i  v;
    v.push_back("hello /*");
    v.push_back("*/ there");
    v.push_back("hello /*adf*/ me");
    v.push_back("/*ha /*ha /*ha */ haha");
    printNonComment(v);
}

Genc · Answer

// NOTE: Not tested on an editor, may not compile. Think as a pseudo code
// There is condition where this code fails: If there are two comments on the same line like
// some text /* hi there */ some more and /* another comment */ even more text

public static void main(String[] args){

    final String COMMENT_START = "/*";
    final String COMMENT_END = "*/";
    
    bool isCommentStarted = false;
    
    String line = getNextLine();
    
    while(line != null && line.length() >0){

            int index = line.indexOf(COMMENT_START);
            if(index != -1 && isCommentStarted == false){
                // print up until the comment
                System.out.print(line.subString(0, index));
                isCommentStarted = true;
            }
            
            index = line.indexOf(COMMENT_END);
            if(index != -1){
                // print what we have after the comment end
                System.out.print(line.subString(index));
                isCommentStarted = false;
            }

        line = getNextLine();
        System.out.println("");    // write on next line
    }
}

Maia · Answer

import re

lines = []
while True:
    line = getNextLine()
    if line == None:
        break
    lines += line
print re.sub(r'/\*(.|
)*?\*/','',lines.join('
'))

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