cgi - Trouble Storing arguments from Query string in C++ -

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i'm trying parse query string , store each argument in specific string (such apr), i'm having hard time figuring out. right able display each argument url like: ...assign09.cgi?apr=2&term=4&amount=7. able '2' '4' , '7' out of this, whenever try assign value string, internal server error. also, think running off of string because '?' @ end of output loop.

my main question is: way parse query string want? 

 #include <iostream>  #include <string>  #include <cstdlib>  using namespace std;   int main ()  {   cout << "content-type:text/html\r\n\r\n";   string s = getenv("query_string");   string apr;   string loanterm;   string loanamount;   string monthlypayment;    // apr, loanterm, , monthlypayment   string args[3];   cout << "<html>\n";   cout << "<head>\n";   cout << "<title>hello world - first cgi program</title>\n";   cout << "</head>\n";   cout << "<body>\n";   cout << "<h1>monthly mortgage</h1>\n";   cout << "<p>" << s << "</p>\n";   for(int = 0; < s.length(); i++)     {         if(s[i] == '=')        {           for(int k = + 1; s[k] != '&'; k++)          {             cout << "<p>" << s[k] << "</p>";          }       }    }     cout << "</body>\n";    cout << "</html>\n";     return 0;    }


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