Node:Exercises,
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Exercises
- Add some new functions from 
math.h to the initialization list.
 - Add another array that contains constants and their values.  Then
modify 
init_table to add these constants to the symbol table. 
It will be easiest to give the constants type VAR.
 - Make the program report an error if the user refers to an
uninitialized variable in any way except to store a value in it.