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Using The -D And -U Command-line Options
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Identifiers can be defined and undefined using the command-line compiler options -D and -U. 

The command line

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BCC32 -Ddebug=1; paradox=0; X -Umysym myprog.cbc++ -Ddebug=1:paradox=0:X -Umysym myprog.c
bc++ -Ddebug=1:paradox=0:X -Umysym myprog.c

is equivalent to placing

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#define debug 1
#define paradox 0

in the program.

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