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education/software development/ECE1400/Chapter 15 Exercises.md
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@ -18,6 +18,7 @@ Yes, `""` is a path relative to the current file, whereas `<>` is a path to the
> **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
@ -25,5 +26,13 @@ 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`?
>
```
Output if DEBUG is not defined:
```
> (c). Explain why the output is different in parts (a) and (b)
When `DEBUG` is defined, any instances of the `PRINT_DEBUG` token are replaced with a `printf` call during compile time, but when it's not defined, they're replaced with nothing.