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Cx51 User's Guide
Cx51 Introduction Compiling Programs Language Extensions Preprocessor Advanced Programming 8051 Derivatives Error Messages Library Reference 
Appendix A. ANSI C Implementation 
Implementation-defined Behavior Compiler-Related Library-Related B. Version Differences Version 6.0 Differences Version 5.0 Differences Version 4.0 Differences Version 3.4 Differences Version 3.2 Differences Version 3.0 Differences Version 2.0 Differences C. Writing Optimum Code Memory Model Variable Location Variable Size Unsigned Types Local Variables Other Sources D. Compiler Limits E. Byte Ordering F. Hints, Tips, and Techniques Recursive Code References Problems Using printf Uncalled Functions Using Monitor-51 Trouble with bdata Function PointersA. ANSI C Implementation
The Cx51 Compiler is based on ISO/IEC 9899:1990 standard (which is also known as ANSI C Standard C90). This appendix describes the Implementation-defined Behavior and lists differences to the ANSI C Standard.
The Cx51 Compiler differs in only a few aspects from the ANSI C Standard. These differences can be grouped into compiler-related differences and library-related differences.
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