我应该使用什么数据类型来存储非终止有理数

Question

For example, when I store 5/3 as a double, I get 1.0 returned. What datatype should I use for real numbers like 5/3 so that it returns 1.67 in java?

Answer 1

Say 5.0/3 and you will get 1.666....6667.

5/3 is integer, truncated to 1.

Answer 2

Do something like ((double) 5) / 3. This will tell the compiler to cast the values to double.

As for what representation one should use with fractions : Either choose a sufficient precision with a double, or create your own fractional type.