A(n) ______ is a location in memory, referenced by an identifier, where a data value that cannot be changed is stored.
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______ is the formal rules governing how valid instructions are written in a programming language.
The integer value that the main function returns to the operating system is called the ______ .
During the compilation phase, a C++ source program is processed first by the ______ program and then by the compiler.
In C++ systems, names appearing in #include directives are called ______ files.