从c++字符串中删除注释

Question

我正在尝试做一个项目，从以前编写的程序中删除注释。从理论上讲，我认为它应该工作，但由于某种原因，输出文件最终总是空的……请尽你所能提供帮助……(注:对不起，如果缩进是草率的，复制和粘贴似乎从来没有很好地为我工作)

#include <iostream> 
#include <fstream> 
#include <string> 
using namespace std; 

void comment_destroyer(ifstream&,ofstream&); 

int main (void) {

string filestart;  
string fileend;    
ifstream start;    
ofstream end;      

do {
    cout<<"Name of the file you want to remove comments from: ";
    cin >> filestart;
}  
while ( start.fail() );
cout << "What is the name of the file you want to call the stripped code?: ";
cin >> fileend; 
start.open ( filestart.c_str() );
end.open ( fileend.c_str() );
comment_destroyer (start, end);
start.close();
end.close();
return 0;
  }
// 
//Start of functions
//
void comment_destroyer(ifstream& start, ofstream& end){
    string line; 
    bool found = false;
    int i=0;
    while (! start.eof()){
        getline(start,line); 
        if (line.find("/*")<line.length())
        found = true;
        if (!found){
            for (int i=0;i<line.length();i++)
                {
                    if(i<line.length())
                    if ((line.at(i)=='/') && (line.at(i+1)=='/'))
                    break;
                    else
                    end<<line[i];
                }
        end<<endl;
        }
    if (found)
        {
            if (line.find("*/")< line.length())
            found == false;
        }
    }
}

Answer 1

下面的部分是错误的。使用相等运算符而不是将false赋值给found。

if (found)
    {
        if (line.find("*/")< line.length())
        found == false;
    }
}

将==改为=

if (found)
    {
        if (line.find("*/")< line.length())
        found = false;
    }
}

Answer 2

我认为你的情况不对。字符串。如果没有找到搜索项，Find返回std::string::npos。根据npos，这是-1，所以表达式

 if (line.find("/*")<line.length())
    found = true;

总是设置found为true