Stream errors

[iQChange]

Hello.
I made this program, but I don't know what is wrong:

 #include <fstream>
#include <string>
#include <sstream>
using std::stringstream;
using std::string;
using std::ifstream;
using std::ofstream;
int main(int argc, char* argv[])
{
	char* str;
	string name_t;
	name_t = argv[1];
	ifstream file;
	file.open(name_t.c_str());
	ofstream ofile;
	string name;
	stringstream name_ss;
	name_ss << "code_" << name_t.c_str();
	name = name_ss.str();
	ofile.open(name.c_str());
	ofile<<"<code>";
	while(!file.eof())
	{
		file >> str;
		if(str == "\n")
		{
			ofile << "<br>";
		}

		if(str == "<")
		{
			ofile << "&lt;";
		}
		if(str == ">")
		{
			ofile << "&gt;";
		}
		else
		{
			ofile << str;
		}
	}
	ofile<<"</code>";
} 

Any help will make me happier :)
Thanks.