c#, c++, java provides a number of libraries for solving specific problems, so that when the programmer to solve some problems, do not go to specific underlying operations, and direct calls to the system packaging good step like, but These systems provide libraries in operating efficiency and safety, the ratio of programmers to write their own programs, there may be a lot of advantages, so that the programmer is completely freed from the underlying complexity of the operation, entirely focused on high-level design .

C_jiaocheng.pdf

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