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The #if and #endif directives enable conditional compilation of a sequence of code based upon whether an expression involving one or more symbols evaluates to true A symbol is true if it has been defined It is false otherwise Thus, if a symbol has been defined by a #define directive, it will evaluate as true The general form of #if is #if symbol-expression statement sequence #endif If the expression following #if is true, the code that is between it and #endif is compiled Otherwise, the intervening code is skipped The #endif directive marks the end of an #if block A symbol expression can be as simple as just the name of a symbol You can also use these operators in a symbol expression: !, = =, !=, &&, and || Parentheses are also allowed Here s an example:

// Demonstrate #if, #endif, and #define #define EXPERIMENTAL using System; class Test { static void Main() { #if EXPERIMENTAL ConsoleWriteLine("Compiled for experimental version");

16:

All the properties of limits that will be developed in this chapter, as well as the rest of the book, apply equally well to one-sided limits as to two-sided (or standard) limits

#endif ConsoleWriteLine("This is in all versions");

This program displays the following:

The program defines the symbol EXPERIMENTAL Thus, when the #if is encountered, the symbol expression evaluates to true, and the first WriteLine( ) statement is compiled If you remove the definition of EXPERIMENTAL and recompile the program, the first WriteLine( ) statement will not be compiled, because the #if will evaluate to false In all cases, the second WriteLine( ) statement is compiled because it is not part of the #if block As explained, you can use operators in a symbol expression in an #if For example,

get anyone from the admissions department to tell them why he d been rejected Their idea was to nd out why the student had been rejected and x the problem Given they had been unable to get any information, he was writing to me in the hope that I d arrange for someone to break into the admissions department to nd and photocopy the student s records Can you imagine Kya went on to explain that she d considered ignoring the fax but decided she had to respond You never know where letters like that will end up ten years later, she said So I felt I needed to do something But I didn t know what Given that I wanted to say no, I knew I should consider the four organizational structures that speci cally deal with delivering bad news It seemed obvious that I didn t want to say anything positive, so the Bookend No wouldn t work I can tell you that I didn t feel like saying Thanks so much for thinking of me The No with an Alternative wouldn t work either What was I going to say Go see Big Eddy on the corner The Diplomatic No wouldn t help; I didn t want to preserve the relationship Given that I d decided I couldn t just do nothing, I felt I had no choice I had to be direct I ended up sending him a two-line response I told him that I was stunned and appalled that he would suggest such a thing No, I wouldn t break into the university admissions department Note that Kya used the organizational structures as a checklist By methodically thinking how each one would sound, her choice became straightforward and easy to make I m pleased to report, Kya added, that I never heard from him again.

To increase our facility in manipulating limits, we have certain arithmetical and functional rules about limits Any of these may be verified using the rigorous definition of limit that was provided at the beginning of the last section We shall state the rules and get right to the examples If f and g are two functions, c is a real number, and limx c f (x) and limx c g (x) exist, then

// Use an operator in a symbol expression #define EXPERIMENTAL #define TRIAL using System; class Test { static void Main() { #if EXPERIMENTAL ConsoleWriteLine("Compiled for experimental version"); #endif #if EXPERIMENTAL && TRIAL ConsoleErrorWriteLine("Testing experimental trial version"); #endif ConsoleWriteLine("This is in all versions"); } }

The output from this program is shown here:

In this example, two symbols are defined, EXPERIMENTAL and TRIAL The second WriteLine( ) statement is compiled only if both are defined You can use the ! to compile code when a symbol is not defined For example,

Part I: