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- 
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.
 
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