Description: Programmed, designed at least 20 different types of data using+,-,*,/, operation combinations, results of the data type and displayed in the console (the use Poly.getType () method). Design at least six kinds of data are 0 and 0.0 except in the case, observing the results, if displayed in the console, then display. Design at least five kinds of char-type data and the int-type data conversion between the situation shown in the console.
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data.java
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