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Introduction

In this chapter, we introduce exception handling. An exception is an indication of a problem that occurs during a program's execution. The name "exception" implies that the problem occurs infrequentlyif the "rule" is that a statement normally executes correctly, then the "exception to the rule" is that a problem occurs. Exception handling enables programmers to create applications that can resolve (or handle) exceptions. In many cases, handling an exception allows a program to continue executing as if no problem had been encountered. A more severe problem could prevent a program from continuing normal execution, instead requiring the program to notify the user of the problem before terminating in a controlled manner. The features presented in this chapter enable programmers to write robust and fault-tolerant programs that are able to deal with problems that may arise and continue executing or terminate gracefully. The style and details of C++ exception handling are based in part on the work of Andrew Koenig and Bjarne Stroustrup, as presented in their paper, "Exception Handling for C++ (revised)."[1]

[1] Koenig, A., and B. Stroustrup, "Exception Handling for C++ (revised)," Proceedings of the Usenix C++ Conference, pp. 149176, San Francisco, April 1990.

Error-Prevention Tip 16.1

Exception handling helps improve a program's fault tolerance.

Software Engineering Observation 16.1

Exception handling provides a standard mechanism for processing errors. This is especially important when working on a project with a large team of programmers.


The chapter begins with an overview of exception-handling concepts, then demonstrates basic exception-handling techniques. We show these techniques via an example that demonstrates handling an exception that occurs when a function attempts to divide by zero. We then discuss additional exception-handling issues, such as how to handle exceptions that occur in a constructor or destructor and how to handle exceptions that occur if operator new fails to allocate memory for an object. We conclude the chapter by introducing several classes that the C++ Standard Library provides for handling exceptions.

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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