c and c++ programming difference-III

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c and c++ programming difference-III: C++ has a much larger library: C++ has a much larger library than C, and some things may be automatically linked in by C++ when they are not with C. For instance, if you're used to using g++ for math-heavy computations, then it may come as a shock that when you are using gcc to compile C, you need to explicitly include the math library for things like sin or even sqrt: % g++ foo.cc or % gcc foo.c -lm