Java Tutorial/Data Type/Float Point Data Type

Applying the modulus operator, %, to floating-point values

public class MainClass{
  public static void main(String[] arg){
     double a = 2.4;
     double b = 0.2;
     
          
     System.out.println( a % b );
  }
}

0.1999999999999998

Floating-Point Calculations

The four arithmetic operators: +, -, *, /.

public class MainClass {
  public static void main(String[] args) {
    double numA = 50.0E-1;   // 5.0
    double numB = 1.0E1;     // 10.0
    double averageC = 0.0;
    averageC = (numA + numB) / 2.0;
    
    System.out.println(averageC);
  }
}

7.5

Floating-Point Data Types: memory and length

Type float and type double are two primitive floating-point types in Java.

Data TypeDescriptionMemoryfloat-3.4E38 to +3.4E384 bytes in memorydouble-1.7E308 to +1.7E3088 bytes in memory

Examples of float literals include the following:

2elf
8.f
.5f
0f
3.14f
9.0001e+12f

Using ++ and -- with floating-point variables

public class MainClass{
  public static void main(String[] arg){
     double a = 12.12;
     
     System.out.println( a-- );
     System.out.println( a++ );
     System.out.println( --a );
     System.out.println( ++a );
  }
}

12.12
11.12
11.12
12.12

Write Floating-Point Literals with an exponent

Write the number as a decimal value followed by an E, or an e.

1. Floating-point literals are of type double by default.
2. To specify a value of type float, you append an f, or an F.

public class MainClass{
  public static void main(String[] arg){
     double f1 = 1.496E8;
     double f2 = 9.0E-28; 
  
     System.out.println(f1);
     System.out.println(f2);
     System.out.println(f2 + f1);
  }
}

1.496E8
9.0E-28
1.496E8