| 16.3.1.Demonstrate #if, #endif, and #define. |
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- The #if and #endif directives enable conditional compilation.
- A symbol is true if it has been defined.
- A symbol is false if it has not been defined.
- If a symbol has been defined by a #define directive, the symbol true.
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The general form of #if is |
#if symbol-expression
statement sequence
#endif
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#define AAA
using System;
class MainClass {
public static void Main() {
#if AAA
Console.WriteLine("Compiled for experimental version.");
#endif
Console.WriteLine("This is in all versions.");
}
}
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Compiled for experimental version.
This is in all versions. |