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The primary purpose of conditional compilation is to tailor the code for different build configurations or to isolate code meant for debugging purposes. In this example, the DEBUG symbol is defined, so the code inside the #if DEBUG block will be included during compilation.

In computer programming, conditional compilation is a compilation technique which results in an executable program that is able to be altered by changing specified parameters.

8.2 Conditional Compilation (#if, #ifdef, #ifndef, #else, #elif, #endif, and defined) Six directives are available to control conditional compilation. They delimit blocks of program text that are compiled only if a specified condition is true.

To implement conditional compilation, define a static final boolean value as a non-private member of some class. place code which is to be conditionally compiled in an if block which evaluates the boolean. set the value of the boolean to false to cause the compiler to ignore the if block; otherwise, keep its value as true.

Symbols can be used to specify conditions for compilation. You can test for the symbol with either #if or #elif . You can also use the ConditionalAttribute to perform conditional compilation. You can define a symbol, but you can't assign a value to a symbol.

You declare a conditional compiler constant in code with the #Const directive, and you denote blocks of code to be conditionally compiled with the #If...Then... #Else directive. The following example runs debug code or production code, based on the value of the variable.

1 The #if Directive. The #if directive has the following syntax: #if constant-expression newline. ... 2 The #ifdef Directive. The #ifdef directive has the following syntax: #ifdef identifier newline. ... 3 The #ifndef Directive. ... 4 The #else Directive. ... 5 The #elif Directive. ... 6 The #endif Directive. ... 7 The defined Operator.

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Conditional statements always have an if part, which tells the app what to do when the condition is true. Conditional statements also usually have an else part, which tells the app what to do when the condition is false. If you leave out the else part then your app will do nothing when the condition is false.

In Geometry, conditional statements, which are also called If-Then statements, are written in the form: If p, then q. Mathematicians will also use logic symbols to indicate a conditional statement, using an arrow to replace the words if and then. The sentence below is read p implies q.