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iostream.h is deprecated and should not be used. It was originally shipped with early versions of C++ which used CFront to produce C compatible code from C++ source. Later, when C++ was standardised, iostream.h became iostream (without the .h extension), but many implementers shipped with both versions. However, iostream.h is not standards compliant and should not be used today. In most cases the file can simply be deleted unless you have non-compliant legacy code that requires it.

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