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Chapter 12. The Preprocessor > Exercises
Exercises
| 1: | Locate the system header files stdio.h, limits.h, and float.h on your machine (on Unix systems, look inside the /usr/include directory). Examine the files to see what's in them. If these files include other header files, be sure to track them down as well to examine their contents. |
| 2: | Define a macro called MIN that gives the minimum of two values. Then write a program to test the macro definition. |
| 3: | Define a macro called MAX3 that gives the maximum of three values. Write a program to test the definition. |
| 4: | Write a macro called IS_UPPER_CASE that gives a nonzero value if a character is an uppercase letter. |
| 5: | Write a macro called IS_ALPHABETIC that gives a nonzero value if a character is an alphabetic character. Have the macro use the IS_LOWER_CASE macro defined in the chapter text and the IS_UPPER_CASE macro defined in exercise 4. |
| 6: | Write a macro called IS_DIGIT that gives a nonzero value if a character is a digit '0' through '9'. Use this macro in the definition of another macro called IS_SPECIAL, which gives a nonzero result if a character is a special character—that is, not alphabetic and not a digit. Be sure to use the IS_ALPHABETIC macro developed in exercise 5. |
| 7: | Write a macro called ABSOLUTE_VALUE that computes the absolute value of its argument. Make sure that an expression such as
90 ABSOLUTE_VALUE (x + delta) is properly evaluated by the macro. |
| 8: | Consider the definition of the printint macro from this chapter:
90
#define printx(n) printf ("%i\n", x ## n)
Could the following be used to display the values of the 100 variables x1–x100? Why or why not? 90 for ( i = 1; i <= 100; ++i ) printx (i); |
