stuff i dont know yet
progress yo
fixed a little. expressions and functions left

asdf
time to local edit
Input Statement done

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FUNCTIONS FINISHED except recursion
interpreter's done

except for right to left eval
misc changes

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To fix: R to L, switch
Added additional error checking

To fix: R to L, switch
Negative numbers done

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Error formatting semi finished
Merge pull request #29 from Vandenn/master

Pull