first attempt to write getExpression
disable specific warning to use "while (true)"
first attempt to write getTerm
added modulo operation (%)
had to use narrow_cast<int> for that
changed all chars and doubles to their appropriate typedefs (tValType and tKindType)
forgot t = getToken(); in getTerm()
forgot default case
moved NUMBER constant from tokenClass.cpp to TokenStream.h
first attempt to write getPrimary()
added constant ERR_VALUE = 0.0 for getPrimary to return to suppress warnings