C++ is a compiled language. This means that C++ code is not intended as an instruction set for machines (such as ARMv7-A chips) or virtual machines (such as the Java Virtual Machine or JVM). Rather, we use a tool named a compiler to translate C++ code into instructions that a given platform can understand. Each C++ source file is compiled to produce one object file (not to be confused with the term "object" in object-oriented programming). Then, we use a tool named a linker to combine multiple object files into either a library or an executable. The linker can also combine libraries to produce other libraries or executables. The linkage of libraries may be either static (meaning that a given version of the input library is "baked into" the output) or dynamic (meaning that any available version of the library may be loaded at runtime). Android NDK provides a tool named ndk-build, which abstracts the use of the compiler and linker, but we must still specify certain...