where is the file?

Question

C++: if i have to open a file using C++ then i declare
ifstream fin("input.txt");
how can i be sure that the program knows where the file is?
anyway i can test it(if the file is opened)?

Answer 1

it has to be in the same directory as the program

Answer 2

To be certain that the program knows where the file is, give it's location not just the file name. In other words:
"c:\input.txt" on windows or "/user/myhome/input.txt" on Unix or Linux.

Answer 3

possibly best to fully qualify the file - so instead of "input.txt" you would put something like "C:/my_directory/input.txt" - that way you know it's exactly where you think it is...

Answer 4

Dont forget to use double backslash in C
"C:\\input.txt"

Answer 5

look at the program's menu for settings and find folders(default). default directories might be defined somewhere in the settings!