去注释程序之C++版

  额。。。昨天看到优快云上一堆人在讨论这个，其实一点也不难，只是看你考虑是否全面，比如：注释符号如果出现在引号中。。。

  写的可能难看了一点，临时之作，见谅。。。

#include<iostream>
#include<fstream>
using namespace std;
int main(int argc,char *argv[])
...{
    fstream fin("in.cpp",fstream::in);
    fstream fout("out.cpp",fstream::out);
    char ch,prev,next=0;
    bool inDoub=false;
    bool inSing=false;
    while(fin)...{
        fin.get(ch);
        fin.get(next);
        fin.seekg(-1,fstream::cur);
        switch(ch)
        ...{
            case '"':
                if(prev!='/' && !inDoub) 
                    inDoub=true;
                else if(prev!='/' && inDoub)
                    inDoub=false;
                break;
            case ''':
                if(prev!='/' && !inSing) 
                    inSing=true;
                else if(prev!='/' && inSing)
                    inSing=false;
                break;
            case '/':
                if(inDoub || inSing)
                    break;
                if(next=='/')...{
                    while((ch=fin.get())!=' ');
                    break;
                }
                else if(next=='*')...{
                    while(true)...{
                        ch=fin.get();
                        next=fin.get();
                        if(ch=='*' && next=='/')...{
                            ch=fin.get();
                            break;
                        }
                        else fin.seekg(-1,fstream::cur);
                        if(ch==' ')...{
                            fout.put(ch);
                        }
                    }
                    break;
                }
            default:break;
        }
        prev=ch;
        fout.put(ch);
    }
    fin.close();
    fout.close();
    return 0;
}