constructing filename string at runtime

[drsmooth]

i need to open a file whose name i only know part of until runtime.

it is based on a char value.
the char represents gender and is either 'm' or ''f'

i need to load from a text file called names_m.txt or names_f.txt but i don't know until runtime.

i tried this but it didnt quite work...

 char fileName[18] = {"/data/names_"};
  fileName[13] = gender;
  fileName[14] = '.';
  fileName[15] = 't';
  fileName[16] = 'x';
  fileName[17] = 't';
  fileName[18] = '\0';

i want to use an fstream to open the file in the folder 'data' at the working directory

[weaknessforcats]

[C++ Error] Civilian.cpp(36 ): E2285 Could not find a match for 'fstream::basic _fstream(string ,enum)'

Did you include <fstream>??