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Scripts 12.1, 12.2 And 12.3

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Hi Larry,


I have loaded these 3 scripts into my Dev-C++ IDE and they work just fine.  But I don't understand how main.cpp 'knows' about Rational.cpp; there doesn't seem to be any direct reference to it either from main.cpp or Rational.h.


Also, I had to add <stdlib.h> to Rational.cpp to cater for the abs (absolute value) bit in the 'normalize' method.


Any enlightenment will be most appreciated and thank you in anticipation.


Cheers from Oz.



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