Floating-Point types

TARGET LANGUAGE:JAVA
THEORY:(DATA TYPE:Float)

Floating Point Type

Floating point numbers also known as real numbers are used when evaluating expressions that require fractional precision.

Example:

1. Calculations such as  square root..

Program:

public class CalculateSquareRootWithMathSqrt
 {
 public static void main(String[] args) 
        {       
                float a=30;
                 
  // square root of 16 which equals with 4
  System.out.println(Math.sqrt(16));
   
  // square root of 44 which is 6.6332495807108
  System.out.println(Math.sqrt(44));
  
  // sin of 30 is -0.9880316240928618
  System.out.print(Math.sin(a));
  
  //cos of 30 is 0.15425144988758405
  System.out.print(Math.cos(a));
        }

}

There are two kinds of floating point types Float and double.

Their ranges are specified in the table below.

Primitive  data Types

FLOAT

• The type specifies a single precision value that uses 32 bit of storage.
• Variables of float are useful when you need a fractional component but don't require large degree of precision. 

DOUBLE

• The type specifies double  precision values that uses 64 bit of storage
• Variables of float are useful when you need a fractional component but  require large degree of precision. 

Program: Area of circle

class Area

{

 public static void main(String args[])

 {

   double pi,r,a;

   r=10.7;//radius of circle

   pi=3.14;//pi,approximately

   a=pi*r*r;//compute area

   System.out.print("Area of circle"+a);

 }

}

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In the next publication,we shall see character type and then literals.

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After which we shall take a closer look at the simple program...in the next Publication 

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