Errata for K&R
K&R, a.k.a. The C Programming Language is, so far as I can tell, the best book ever written about C.
It is well written, and almost invariably correct.
The following is a list of the errors I am aware of, sorted by
page number. It is a very small list for a 200+ page book about
the C language; an equivalent list for Herbert Schildt's C: The Complete Reference would be at least 90k. (For the third edition; earlier ones were
I am probably missing several errors. Please write me if you think
you know of any I'm missing.
- Various places
- Several functions are provided which implement parts of the standard
library; this is technically not allowed, as those names are reserved.
e.g., if one wished to implement a quicksort function, one would
be obliged to name it something other than "qsort".
- Page 114
- Near the top, a quote is missing after the name Jan.
- Page 117
- The sample program increments
argv is modifiable, and
argv is modifable (if
argv is not a null pointer),
argv is not modifiable. (At least, not always.)
- Page 119
- The sample program casts function pointers in a very dubious way.
- Page 167
- It is asserted that the pointer returned by malloc or calloc must be converted to an appropriate type; this is not true in
- Page 241
- Of course, actually the library is a part of the language, and although it must be possible to take
the address of the functions in the library, a compiler is allowed
to inline and optimize calls, and many do. However, it is a part
of the language definition. (Of course, it's not a part of a freestanding
implementation; in this respect, the book is correct.)
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