編譯器之預先處理程式 （去除注釋符）

///beforeBegin.cpp
// 預先處理來源程式，去除檔案中的注釋字元  // 和 /* lllll */
#include <string>
#include <cstddef>
#include <sstream>
#include <fstream>
#include <iostream>
using namespace std;

//刪除字串中的 // 注釋符
string& deleteNote1(string& ss){
 size_t lookHere = 0 ;
 size_t foundHere;
 size_t secondHere;
 while((foundHere = ss.find("//",lookHere)) != string::npos){
  secondHere = ss.find("/n",foundHere);
  ss.erase(foundHere,secondHere-foundHere);
  lookHere = foundHere;
 }
 return ss;
}
//刪除字串中的 /* */ 注釋符
string& deleteNote2(string& ss){
 size_t lookHere = 0 ;
 size_t foundHere;
 size_t secondHere;
 while((foundHere = ss.find("/*",lookHere)) != string::npos){
  secondHere = ss.find("*/",foundHere);
  ss.erase(foundHere,secondHere-foundHere+2);
  lookHere = foundHere;
 } 
 return ss;
}

string& beforeBegin(string& ss){
 return deleteNote1(deleteNote2(ss));
}

int main(){
 ifstream in("Wowbull.cpp");
    ostringstream oss;
 oss << in.rdbuf();
 //string s = oss.str();
 //istringstream ins(replaceAll(s,"from","to"));
   
 ofstream out("www.cpp");
   // out << ins.str();
 out << beforeBegin(oss.str());
 return 0;
}