Code not working right

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2

I haven't followed the whole flow but this does not look right

 if ((optkey == '+')||(optkey == '-')||(optkey == 'x')||
     (optkey == 1)||(optkey == '=')||(optkey == '*')){

I would expect

 if ((optkey == '+')||(optkey == '-')||(optkey == 'x')||
     (optkey == '1')||(optkey == '=')||(optkey == '*')){

i.e. '1' rather than just 1