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Float and double datatype in Java

The float data type is a single-precision 32-bit IEEE 754 floating point and the double data type is a double-precision 64-bit IEEE 754 floating point.

What does it mean? And when should I use float instead of double or vice-versa?

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float give you 8 digits precision. The result of System.out.println(Float.parseFloat("0.123456789")); -> 0.12345679

gshock
– gshock

2024年10月05日 06:35:14 +00:00
Commented Oct 5, 2024 at 6:35
1

@gshock try also System.out.println(Float.parseFloat("0.987654321")); which gives you 0.9876543

Henry
– Henry

2024年10月10日 13:05:35 +00:00
Commented Oct 10, 2024 at 13:05
1

Ok. I found an article that explained it very well arshadsuraj.medium.com/…. Thanks ✌️

gshock
– gshock

2024年10月10日 21:26:03 +00:00
Commented Oct 10, 2024 at 21:26
This precision is strongly depends on how many mathematical operations (like addition) you execute over numbers (float or double). With each operation there is some error (in mathematical sense). These errors accumulate. After like 100.000 additions for float the actual precision is like 3 digits and for long it's like 8 digits.

Krzysztof Tomaszewski
– Krzysztof Tomaszewski

2025年01月21日 15:50:45 +00:00
Commented Jan 21, 2025 at 15:50
@KrzysztofTomaszewski don't mix up precision and accuracy. Rounding errors influence the accuracy, You can loose almost all accuracy even with a single operation if you subtract two nearly equal quantities.

Henry
– Henry

2025年01月22日 16:54:53 +00:00
Commented Jan 22, 2025 at 16:54

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Float and double datatype in Java

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