Unspecified, undefined and implementation defined behavior WIKI for C

Question

Although there is plentiful of links about this subject on SO, I think that there is something missing: a clear explanation in plain language of what are the differences bet

Answer 1

N1570 is a draft of the ISO C standard, very close to the official ISO document.

N1256 is an earlier draft, incorporating the C99 standard plus changes from the three Technical Corrigenda.

Annex J has 5 sections, each of which gathers information that's scattered through the rest of the standard:

• J.1 Unspecified behavior
• J.2 Undefined behavior
• J.3 Implementation-defined behavior
• J.4 Locale-specific behavior
• J.5 Common extensions