| 16.2.1.Demonstrate #elif |
|
|
- The #else directive establishes an alternative if #if fails.
- #else marks both the end of the #if block and the beginning of the #else block.
- The #elif directive means "else if".
- The #elif directive establishes an if-else-if chain for multiple compilation options.
- #elif is followed by a symbol expression.
- There can be only one #endif associated with any #if.
- If the expression is true, that block of code is compiled, and no other #elif expressions are tested.
|
The general form for #elif is |
#if symbol-expression
statement sequence
#elif symbol-expression
statement sequence
#elif symbol-expression
statement sequence
#elif symbol-expression
statement sequence
#elif symbol-expression
.
.
.
#endif
|
|
#define AAA
#define RELEASE
using System;
class MainClass {
public static void Main() {
#if AAA
Console.WriteLine("Compiled for AAA version.");
#elif RELEASE
Console.WriteLine("Compiled for release.");
#else
Console.WriteLine("Compiled for internal testing.");
#endif
#if BBB && !RELEASE
Console.WriteLine("BBB version.");
#endif
Console.WriteLine("This is in all versions.");
}
}
|
|
Compiled for AAA version.
This is in all versions. |