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## Why do we use double instead of float in Java?

Reason : **Java by default stores real numbers as double to ensure higher precision**. Double takes more space but more precise during computation and float takes less space but less precise. According to the IEEE standards, float is a 32 bit representation of a real number while double is a 64 bit representation.

## Why do we use double parseDouble?

The parseDouble() method of Java Double class is a built in method in Java that **returns a new double initialized to the value represented by the specified String**, as done by the valueOf method of class Double. … Return type: It returns e double value represented by the string argument.

## What is the double data type?

double: The double data type is **a double-precision 64-bit IEEE 754 floating point**. Its range of values is beyond the scope of this discussion, but is specified in the Floating-Point Types, Formats, and Values section of the Java Language Specification. For decimal values, this data type is generally the default choice.

## 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.

## Can we convert double to string in Java?

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

## Which is bigger double or long Java?

3 Answers. If you are storing integers, **use Long** . Your statement that “Advantage of Using Double is that it gives a more wider range for storing Whole Numbers” is incorrect. Both are 64 bits long, but double has to use some bits for the exponent, leaving fewer bits to represent the magnitude.

## 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.

## Is double 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.

## What exception does parseDouble throw?

The unchecked exception route is basically what Double. parseDouble takes – if parsing fails, it throws an **unchecked NumberFormatException** .

## How do you convert a double into a string?

**There are three ways to convert double to String.**

- Double.toString(d)
- String.valueOf(d)
- “”+d. public class DoubleToString { public static void main(String[] args) { double d = 122; System.out.println(Double.toString(d)); System.out.println(String.valueOf(d)); System.out.println(“”+d); } }