Asking user input linux and gcc

Hi, I'm introducing myself in development in c/c++, I've got experience on basic and also I know the way the programs in c and c++ are structure, nevertherless a friend of mine showed me a program in order to show me ifstream usage, on windows with a ifstream input I only call the program this way (sudokucpp.exe sudoku4.in) but in gcc 4 series (ubuntu 8.10) I make ./sudokucpp sudoku4.in and nothing, I'd be pleased if someone could lend me a hand in console arguments on linux.
Be sure that you have all the files in the right directories
What a fool, thanks bazzy, it appeared that build-essential was not properly set up in my machine
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