The American National Standards Institute sells
ISO 9899:1990 (the C language standard) for around
$130. Schildt's annotated version sells for about
$30-40. The price difference reflects the value
of the annotations.
At no time do the annotations clarify, enhance,
or supplement the standard. The difficult or
obscure points are often ignored; occasionally,
"clarifying" text is added which flatly
contradicts the meaning of the text.
To comprehend how bad this really is, understand that 9899:1990 is the Standard; 9899-1990, as the book refers to it, would refer to the one thousand, nine hundred and ninetieth revision of that standard. Truly, incompetent from cover to cover, even including the spine.
The redeeming feature? Despite (in at least one
edition) a missing page of the standard, a few
missing punctuation marks, and a few other botches, this does contain the text of the
standard as it stood in 1990.