正确保存到带有文件名的文件

Question

 ofstream myfile;
    string s=r->str_name+".txt";
    myfile.open (s);

where r->str_name is a string. If r->str_name was "animals" , would it save the file as animals.txt if i concatenate like this?

Answer 1

Close. It does do as you expect in that r->str_name will be "animals.txt" but to pass it to myfile.open() you have to turn it into a const char* like so:

myfile.open (s.c_str());