> **1.** Section 15.1 listed several advantages of dividing a program into multiple source files.(a). Describe several other advantages

> (b). Describe some disadvantages

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> **2.** Which of the following should *not* be put in a header file? Why not?

b. Function definitions - Functions should only be defined once, and this allows multiple files to share the same function definition

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> **3.** We saw that writing `#include <file>` instead of `#include "file"` may not work if file is one that we've written. Would there be any problem with writing `$include "file"` instead of `#include <file>` if *file* is a system header?

Yes, `""` is a path relative to the current file, whereas `<>` is a path to the system's standard library headers.

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> **4.** Assume that `debug.h` is a header file with the following contents...
>(a). What is the output when the program is executed?
```
Output if DEBUG is defined:
Value of i: 1
Value of j: 2
Value of i + j: 3
Value of 2 * i + j - k: 1
```
> (b). What is the output if the `#define` directive is removed from `testdebug.c`?
>