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
    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
      1. InputStream
        1. readExact
        2. read
        3. readLine
        4. opApply
        5. readString
        6. getc
        7. ungetc
        8. scanf
        9. available
        10. eof
        11. isOpen
      2. OutputStream
      3. 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
ungetc 
char ungetc(char c);
wchar ungetcw(wchar c);


Pushes one character back on the stream, it will be the next character read by std.stream.InputStream.getc. ungetcw is for Unicode wide-chars, as usual.
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