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C COMPILER->C Language Definition->General Language Extensions

General language extensions provided by the compiler include:
    

• variables can be any length with all characters significant
  
• the C++ commenting convention // is supported
  
• the _interrupt keyword declares C functions as an interrupt routine
  
• the _persist keyword declares that a variable will retain its contents (eg. in battery backed-up ram) during power down and should therefore not be initialised
  
• the #asm and #endasm preprocessor directives allow assembler code to be inserted into the C source code.