C Primer Plus®, Third Edition

Review Questions

1. Here are groups of one or more macros followed by a source code line that uses them. What code results in each case? Is it valid code?

   1. #define FPM  5280     /* feet per mile */
      dist = FPM * miles;
      

   2. #define FEET 4
      #define POD FEET + FEET
      plort = FEET * POD;
      

   3. #define SIX = 6;
      nex = SIX;
      

   4. #define NEW(X) X + 5
      y = NEW(y);
      berg = NEW(berg) * lob;
      est = NEW(berg) / NEW(y);
      nilp = lob * NEW(-berg);
      

2. Fix the definition in 1.d. to make it more reliable.

3. Define a macro function that returns the minimum of two values.

4. Replace the even_gt() macro in Listing 16.4 with a macro of your own devising.

5. Define a macro function that prints the representations and the values of two integer expressions. For example, it might print

    3+4 is 7 and 4*12 is 48 ...