Micro-C is a subset of C compiler. It compiles everything in 1 pass. Major limitations compared to standard C compilers are: 1) no float or double 2) no bit field 3) limited pre-processor capability (use 'cpp' of UNIX if necessary) 4) no real long (long is only 2 bytes long) Non standard features: 1) #asm and #endasm construction (dangerous, use only after ';' or '}')