F.10. Wrap-Up | Appendix F. Preprocessor

Table of contents:

Answers to Self Review Exercises

F.1

a) #. b) #elif, #else. c) #define. d) white space. e) #undef. f) #ifdef, #ifndef. g) Conditional compilation. h) assert. i) #include. j) ##. k) #. l) .

F.2

(See below.)

 1 // exF_02.cpp
 2 // Self-Review Exercise F.2 solution.
 3 #include 
 4
 5 using std::cout;
 6 using std::endl;
 7
 8 int main()
 9 {
10 cout << "__LINE__ = " << __LINE__ << endl
11 << "__FILE__ = " << __FILE__ << endl
12 << "__DATE__ = " << __DATE__ << endl
13 << "__TIME__ = " << __TIME__ << endl
14 << "__cplusplus = " << __cplusplus << endl;
15
16 return 0;
17
18 } // end main

__LINE__ = 9 __FILE__ = c:cpp4ech19ex19_02.CPP __DATE__ = Jul 17 2002 __TIME__ = 09:55:58 __cplusplus = 199711L

F.3

#define YES 1
#define NO 0
#include "common.h"
#if defined(TRUE) #undef TRUE #define TRUE 1 #endif
#ifdef TRUE #undef TRUE #define TRUE 1 #endif
#if ACTIVE #define INACTIVE 0 #else #define INACTIVE 1 #endif
#define CUBE_VOLUME( x ) ( ( x ) * ( x ) * ( x ) )

Exercises

F.4

Write a program that defines a macro with one argument to compute the volume of a sphere. The program should compute the volume for spheres of radii from 1 to 10 and print the results in tabular format. The formula for the volume of a sphere is

( 4.0 / 3 ) * p * r3

where p is 3.14159.

F.5

Write a program that produces the following output:

The sum of x and y is 13

The program should define macro SUM with two arguments, x and y, and use SUM to produce the output.

F.6

Write a program that uses macro MINIMUM2 to determine the smaller of two numeric values. Input the values from the keyboard.

F.7

Write a program that uses macro MINIMUM3 to determine the smallest of three numeric values. Macro MINIMUM3 should use macro MINIMUM2 defined in Exercise F.6 to determine the smallest number. Input the values from the keyboard.

F.8

Write a program that uses macro PRINT to print a string value.

F.9

Write a program that uses macro PRINTARRAY to print an array of integers. The macro should receive the array and the number of elements in the array as arguments.

F.10

Write a program that uses macro SUMARRAY to sum the values in a numeric array. The macro should receive the array and the number of elements in the array as arguments.

F.11

Rewrite the solutions to Exercise F.4 to Exercise F.10 as inline functions.

F.12

For each of the following macros, identify the possible problems (if any) when the preprocessor expands the macros:

#define SQR( x ) x * x
#define SQR( x ) ( x * x )
#define SQR( x ) ( x ) * ( x )
#define SQR( x ) ( ( x ) * ( x ) )

Introduction to Computers, the Internet and World Wide Web

Introduction to C++ Programming

Introduction to Classes and Objects

Control Statements: Part 1

Control Statements: Part 2

Functions and an Introduction to Recursion

Arrays and Vectors

Pointers and Pointer-Based Strings

Classes: A Deeper Look, Part 1

Classes: A Deeper Look, Part 2

Operator Overloading; String and Array Objects

Object-Oriented Programming: Inheritance

Object-Oriented Programming: Polymorphism

Templates

Stream Input/Output

Exception Handling

File Processing

Class string and String Stream Processing

Web Programming

Searching and Sorting

Data Structures

Bits, Characters, C-Strings and structs

Standard Template Library (STL)