Is scientific notation interpreted as int or float?

java int scientific-notation
Jawap picture Jawap · Mar 20, 2013 · Viewed 7.8k times · Source

If I hardcode a number in my code using the scientific notation (e.g. 1e9) what will the type of that number be (int, long, float, double..)?

When the significand or the exponent are floating point numbers it can't be an integer obviously, but what in the above case?

Answer

NPE picture NPE · Mar 20, 2013

The e makes it a floating-point literal. From the JLS (§3.10.2. Floating-Point Literals):

A floating-point literal is of type float if it is suffixed with an ASCII letter F or f; otherwise its type is double and it can optionally be suffixed with an ASCII letter D or d (§4.2.3).

Therefore, 1e9 of type double, as is 1e9d. On the other hand, 1e9f is of type float.

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