Floating and Double types range in java

Question

I am beginner in Java and I am just reading one of the pdfs for beginners like me. So in my book I found this:

So for example the floating point numbers may be within the range of

1.4E-45 to 3.4028235E+38

So according to my math, that number can be very small (near the zero) or quite large, but it CAN NOT be a negative number.

Am I correct?

Answer 1

The book states the MIN_VALUE and MAX_VALUE for the floating point types. This range describes available precision but it is certainly not the case that all values must fall between MIN_VALUE and MAX_VALUE as you can easily confirm by assigning zero or a negative number to a float variable.

Floating point values (float and double) can be one of the following:

• NaN (not a number)
• negative infinity
• a negative number between -MAX_VALUE and -MIN_VALUE
• negative zero
• positive zero
• a positive number between MIN_VALUE and MAX_VALUE
• positive infinity

Answer 2

Float range is approximately ±3.40282347E+38F (6-7 significant decimal digits) Java implements IEEE 754 standard.

Refer below links

https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html

http://cs-fundamentals.com/java-programming/java-primitive-data-types.php