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In the context of programming and function calls, it is crucial to understand the concept of function declaration and invocation. When calling a function like setLetter(word, letter, display), the actual implementation of the function does not necessarily need to compile for the call to be valid during the compilation of other parts of your program.
The function declaration itself provides a prototype that informs the compiler about the function's expected parameters and return type, but until the function is actually invoked during runtime, the implementation doesn't have to exist. Therefore, if the function is called in your code, it is not required for the actual body of the function to be compiled for that call to be valid.
If the function setLetter is invoked but not defined, the program can still successfully compile the calls that do not directly depend on the implementation of setLetter. Hence, it’s correct that none of the function's code needs to be compiled for the rest of the code to compile successfully, which allows the statement that none are needed to compile or run. Thus, this shows a critical understanding of how function calls work concerning their definitions and how compilers handle those calls.