Exercises
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{fH3}Exercises{f}

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 1. Add some new functions from {fCite}math.h{f} to the initialization list.

 2. Add another array that contains constants and their values.  Then
modify {fCode}init\_table{f} to add these constants to the symbol table.
It will be easiest to give the constants type {fCode}VAR{f}.

 3. Make the program report an error if the user refers to an
uninitialized variable in any way except to store a value in it.

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