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For C++ programs, you use g++, rather than gcc (so that the standard C++ library is linked automatically). Also, you should be using "iostream", rather than "iostream.h". The latter is the older form of the header and it probably doesn't exist on your system (it certainly doesn't on mine).
Also, the -o flag is used to specify the name of the executable, so you're not actually giving a source file to be compiled, hence the error message in the second case.
Thank U sir, after over a year of C programming, i was into C++ classes for over a week. i had covered much but inability to compile and test some programs was irritating. But thank U again sir, i have compiled my first C++ program. I will always be grateful to U.