Posted by: ANS April 7, 2009
MS-DOS
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From the question, it is obvious you are new in programming.

It is not DOS that makes C++ program run. It is something called C++ compiler which runs in a computer. DOS is just a command line interface (a channel to communicate with Operating system). You can write any text editor (e.g. notepad) to write the program. But it is error prone cuz it does not highlight syntax error.

You can use any Graphical Interface, (where you see beautiful buttons, arrows, and work with mouce clicks). In them you can type your C++ code, error is detected (like MS Word- red underlined), etc. One of such software is bloodshed dev ide (Download here).
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