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

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+> **12.** Suppose that the macro `M` has been defined as follows:
+```c
+#define M 10
+```
+> Which of the following tests will fail?
+```c
+// 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. 
+
+```c
+#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.
+
+```c
+#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);
+```