[Solved] how to read math symbols

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I also think if you had defined it as a character it might simply your work. where you defined 

float innum;
char plus="+";
char minus="+";
char times="x";

…
and then you use 

`if (Character.toString(OP).matches(plus)) { // ... }

this will make your work more granular.

solved how to read math symbols