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sir, i have written a single program while compiling it giving error that iostream.h file or directory file compilation terminated.
iostream.h is part of the old IO Stream library.
Although you can learn C++ using Turbo C++, you should realise that it is well out of date, there have been two major C++ Standard releases since Turbo/Borland C++ was released.
There are free alternatives to more modern C++ implementations.