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+Libraries and header files in c++:
+Difference between library and header files:
+https://stackoverflow.com/questions/924485/whats-the-difference-between-a-header-file-and-a-library
+Different types of libraries in c++:
+https://www.tutorialspoint.com/cplusplus/cpp_standard_library.htm
+c++ standard library:
+https://www.programiz.com/cpp-programming/library-function