notes/education/computer engineering/ECE1400/Chapter 14 Exercises.md

12. Suppose that the macro M has been defined as follows:

#define M 10

Which of the following tests will fail?

// C will fail, because `M` is defined.
#ifndef M

// E will fail, because `M` is defined
#if !defined(M)

---

13. Show what the following program will look like after preprocessing. You may ignore any lines added to the program as a result of including the <stdio.h> header.

#include <stdio.h>

int main(void)
{
	f();
	
}

 void f(void) {
	printf("N is %d\n", 100);
 }

---

15. Suppose that a program needs to display messages in either English, French, or Spanish. Using conditional compilation, write a program fragment that displays one of the following three messages, depending on whether or not the specified macro is defined.

#ifdef ENGLISH
#define MESSAGE "Insert Disk 1"
#endif

#ifdef FRENCH
#define MESSAGE "Inserez Le Disque 1"
#endif

#ifdef SPANISH
#define MESSAGE "Inserte El Disco 1"
#endif

printf(MESSAGE);