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Java float keyword

The Java float keyword is a primitive data type. It is a single-precision 32-bit IEEE 754 floating point. It is used to declare the variables and methods. It represents the fractional numbers.

Points to remember

  • The float covers a range from 1.40129846432481707e-45 to 3.40282346638528860e+38 (positive or negative).
  • Its default value is 0.0f.
  • Its default size is 4 byte.
  • It can be used to save memory in large arrays of floating point numbers.
  • It is not a good approach to use float for precise values, such as currency.

Examples of Java float keyword

Example 1

Let's see a simple example to display float type variable.


num1: 5.5
num2: 5.0

Example 2

In this example, we provide integer value to float variable. Here, compiler implicitly typecast integer to float and display the corresponding value in fractional form.


num1: 5.0
num2: 10.0

Example 3

In this example, we provide bigger decimal value.


num1: 5.812167E8
num2: 7.8368497

Example 4

In this example, we provide float value to the decimal variable.


Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
	Type mismatch: cannot convert from double to float

Example 5

In this example, we provide the end range of decimal value.


num1: 1.4E-45
num2: 3.4028235E38

Example 6

In this example, we provide the value in scientific notation


num1: 1873.2
num2: 1873.2

Example 7

In this example, we create a method returning float value.


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