C# 0 The Complete Reference

checked

 or 

unchecked

 is that the default 

checked/unchecked status of overflow is determined by the setting of a compiler option 

and the execution environment, itself. Thus, for some types of programs, it is best to specify 

the overflow check status explicitly.

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14

Using I/O

T

he earlier chapters of this book have used parts of the C# I/O system, such as 

Console.WriteLine( )

, but have done so without much formal explanation. Because 

the I/O system is built upon a hierarchy of classes, it was not possible to present its 

theory and details without first discussing classes, inheritance, and exceptions. Now it is 

time to examine I/O in detail. Because C# uses the I/O system and classes defined by the 

.NET Framework, a discussion of I/O under C# is also a discussion of the .NET I/O system, 

in general.

This chapter examines both console I/O and file I/O. Be forewarned that the I/O system 

is quite large. This chapter describes the most important and commonly used features.