Modular programming in C++ [duplicate]

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C++ program design

I want to know how modular programs are written in C++ i.e. how they are analysed, designed etc. Also names of reference books will be helpful.

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I would take a look at a link about OOP: OOP Wiki

You'll want to learn about classes as classes are what drives modularity and object-oriented programming.

As for books I always liked C++ From The Ground Up

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You may want to see "Code Complete" by Steve McConnell.

Although it isn't "C++ specific" and it doesn't cover some "deep" aspects of proper application design, it could be a good place to start from.