input/output files in xCode 4.2

when try use input/output files in command line tool applications, can't open xcode, mean, can't change programm.
use c++, freopen("input.txt", "r", stdin) create file.
when used microsoft visual c++ ok, now...may because neсessary write file path?

 

this might you. http://forums.macrumors.com/showthread.php?t=1122174

suspect current working directory not expect.

b

 

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