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
While statement 
while ( /* boolean expression */ )
  statement;

or:

while ( /* boolean expression */ )
{
  statement1;
  statement2;
  // ...
}


Executes the statement as long as the boolean expression is true. If the expression is false from the beginning, it will not execute any statements. If you want the loop to execute your statements at least once, use the Do-While Statement.

Example:
int i = 0;
while (i < 4)
{
  writefln("i = %d", i);
  i++;
}

Output:
i = 0
i = 1
i = 2
i = 3
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