The difference between double and float in java

The difference between double and float in java: (Recommended: java video tutorial)

Single precision floating point number (float) and double precision float The difference between points (double) is as follows:

(1) The number of bytes occupied in the memory is different

Single-precision floating point numbers occupy 4 bytes in the machine

Double-precision floating-point numbers occupy 8 bytes in the machine

(2) The number of valid digits is different

Single-precision floating-point number has different valid digits 8-bit

Double-precision floating-point number, 16-bit valid digits

(3) The range of numbers that can be represented is different

Representation of single-precision floating point Range: -3.40E 38 ~ 3.40E 38

Double precision floating point representation range: -1.79E 308 ~ 1.79E 308

(4) The processing speed in the program is different Generally speaking, the CPU processes single-precision floating-point numbers faster than double-precision floating-point numbers

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