# Your question: Why is double not precise Java?

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## Why is double not precise in Java?

Doubles are binary fractions internally, so they sometimes cannot represent decimal fractions to the exact decimal.

## Why is double not accurate?

When we learn Java programming we have been told that use float and double to represent decimal numbers it’s not been told that result of a floating-point number is not exact, which makes them unsuitable for any financial calculation which requires exact result and not an approximation.

## Is double accurate in Java?

Both Double and float data type are used to represent floating-point numbers in Java; a double data type is more precise than float. A double variable can provide precision up to 15 to 16 decimal points as compared to float precision of 6 to 7 decimal digits.

## What is the precision of double in Java?

The double data type is a 64-bit double-precision IEEE 754 floating-point number. It means that it gives 15-16 decimal digits precision.

## Should I use float or double Java?

You should use double instead of float for precise calculations, and float instead of double when using less accurate calculations. Float contains only decimal numbers, but double contains an IEEE754 double-precision floating point number, making it easier to contain and computate numbers more accurately.

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## Which is bigger float or double Java?

double-takes more space than float in Java. double needs 64-bit storage compare to 32-bit storage of float data type. … float uses 1 bit for sign, 8 bits for the exponent, and 23 bits for mantissa, while double uses 1 bit for a sign, 11 bits for the exponent, and 52 bits for mantissa.

## Can we convert double to string in Java?

We can convert double to String in java using String. valueOf() and Double. toString() methods.

## Should I use float or double for money?

Float and double are bad for financial (even for military use) world, never use them for monetary calculations. If precision is one of your requirements, use BigDecimal instead.

## Why use BigDecimal instead of double in Java?

A BigDecimal is an exact way of representing numbers. A Double has a certain precision. Working with doubles of various magnitudes (say d1=1000.0 and d2=0.001 ) could result in the 0.001 being dropped alltogether when summing as the difference in magnitude is so large. With BigDecimal this would not happen.

## What is difference between double and float?

What’s the difference ? double has 2x more precision then float. float is a 32 bit IEEE 754 single precision Floating Point Number1 bit for the sign, (8 bits for the exponent, and 23* for the value), i.e. float has 7 decimal digits of precision.

## Why double is used in Java?

Java double is used to represent floating-point numbers. It uses 64 bits to store a variable value and has a range greater than float type.

## Is it double or double in Java?

A Double is a class, or a reference type, defined in the standard library. It stores a reference to an object containing a value (a “box”). A double on the other hand, is a primitive type and part of the language itself.

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