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F.6. The #error and #pragma Preprocessor Directives

The #error directive


#error tokens

prints an implementation-dependent message including the tokens specified in the directive. The tokens are sequences of characters separated by spaces. For example,

#error 1 - Out of range error

contains six tokens. In one popular C++ compiler, for example, when a #error directive is processed, the tokens in the directive are displayed as an error message, preprocessing stops and the program does not compile.

The #pragma directive


#pragma tokens

causes an implementation-defined action. A pragma not recognized by the implementation is ignored. A particular C++ compiler, for example, might recognize pragmas that enable the programmer to take advantage of that compiler's specific capabilities. For more information on #error and #pragma, see the documentation for your C++ implementation.

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)

Other Topics

Appendix A. Operator Precedence and Associativity Chart

Appendix B. ASCII Character Set

Appendix C. Fundamental Types

Appendix D. Number Systems

Appendix E. C Legacy Code Topics

Appendix F. Preprocessor

Appendix G. ATM Case Study Code

Appendix H. UML 2: Additional Diagram Types

Appendix I. C++ Internet and Web Resources

Appendix J. Introduction to XHTML

Appendix K. XHTML Special Characters

Appendix L. Using the Visual Studio .NET Debugger

Appendix M. Using the GNU C++ Debugger

Bibliography

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C++ How to Program
C++ How to Program (5th Edition)
ISBN: 0131857576
EAN: 2147483647
Year: 2004
Pages: 627
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