D Documentation  
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  1. Introduction
    1. A simple tutorial
    2. Switching to D
    3. An advanced tutorial
  2. Language Reference
    1. General syntax
    2. Statements
      1. Expression Statements
      2. If statement
      3. While statement
      4. Switch-Statement
      5. Do-While Statement
      6. For statement
      7. Foreach Statement
      8. Try statement
      9. Throw statement
    3. Types
    4. Error Handling
    5. Memory Management
  3. Std. runtime library (Phobos)
    1. std.base64
    2. std.boxer
    3. std.compiler
    4. std.conv
    5. std.ctype
    6. std.date
    7. std.file
    8. std.format
    9. std.gc
    10. std.intrinsic
    11. std.math
    12. std.md5
    13. std.mmfile
    14. std.outbuffer
    15. std.path
    16. std.process
    17. std.random
    18. std.recls
    19. std.regexp
    20. std.socket
    21. std.socketstream
    22. std.stdint
    23. std.stdio
    24. std.stream
    25. std.string
    26. std.system
    27. std.thread
    28. std.uri
    29. std.utf
    30. std.zip
    31. std.zlib
  4. Libraries and Tools
    1. mango
    2. Build
  5. Related Links
  6. About this documentation
If statement 
if ( /* boolean expression*/ )
  statement;
// Optional:
else
  statement;

"If" executes the next statement only if the boolean expression evaluates to "true". If there is an "else" block, it gets executed if the expression evaluates to "false".
The statements that are executed are often block statements.

Example:
if (i == 4)
{
  writef("i is equal to 4");
} else {
  writef("i is not equal to 4");
}


It is also possible to make multiple constructs of if-else, they work as you expect them to work:

if(i == 4) 
{
  // code for i == 4
}
else if(i == 5)
{
  // code for i == 5
}
else
{
  // code for any other i
}
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