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There are three important differences between ANSI C and K&R C:

• The first feature is the prototype - writing the parameter types as a part of the function declaration.  Prototypes make it easy for a compiler to check function use with definition.
   
• Second feature is the addition of new keywords -
• enum for enumerated types
• const
• volatile
• signed
• void

And the ‘entry’ keyword was retired.

• Third category is of "silent changes" - some features that still compiles, but now has a slightly different meaning.  For example, now that the preprocessing rules are more tightly defined, there’s a new rule that adjacent string literals are concatenated.

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Related Blog Items

• ANSI C Reference Card
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• C++ Tutorial Part 2 - Advanced
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• Structure padding explained

This entry was written by Vijay Zanvar and posted on March 15, 2007 at 2:22 pm and filed under C Tidbits, C/C++ Programming Concepts. Bookmark the permalink. Follow any comments here with the RSS feed for this post. Post a comment or leave a trackback: Trackback URL.