Began a new project: an resistance calculator.

It takes in user input in the form of an arithmetic state, with the addition of a new operation, Parallel => '//'. (stuff1)//(stuff2) returns 1/((1/stuff1)+(1/stuff2)). The operator takes precedence over addition/subtraction, but not multiplication/division. I.e., instead of BEDMAS (brackets, exponents, division, multiplication, addition, subtraction), it is now BEDMPAS (brackets,...multiplication, parallel, add...).