Java - Arithmetic Operators / Chapter -2 /Operator & Assignments

1.If we are applying any arithmetic operators between two variables a and b ,then the result type always will be max(int ,type of a,type of b).In java, every arithmetic operator returns minimum type is the int type.let's understand more about this by the following table.

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     example 1:-
    System.out.println('a'+'b');

    output is =195                          hint :-(a=>97 ,b=>98 unicode values)

     example 2:-
    System.out.println('a'+0.16)
    output is => 97+0.16  => 97.16

2.Infinite Role:

• In integral data types(byte,short,int,long) doesn't have any representation for infinity.if we are applying then we won't get any compile time errors but while running the program  we will get RuntimeException saying"ArithmeticExceptionDevide by Zero".

          example :-         System.out.println(20/0);
                                   RuntimeException  :  ArithmeticExceptionDevide by Zero"

•  But in floating point, arithmetic data types (float & double ) infinity concept is there to represent infinity.In floating point data types result is infinity then also we won't get any RuntimeException.         It contains two constant.

1. POSITIVE_INFINITY
2. NEGATIVE_INFINITY

          example:-     
                           System.out.println(20/0.0)       o/p     POSITIVE_INFINITY

                           System.out.println(-20/0.0)       o/p     NEGATIVE_INFINITY

 3.UNDEFINED RESULT

• In integral arithmetic (byte,short, int,long) there is no way to represent undefined results.That's why if anywhere undefined result situation occurs that we  won't get any compile time errors but while running the program  we will get RuntimeException saying"ArithmeticExceptionDevide by Zero".

           example:-                    System.out.println(0/0);                                             RuntimeException  :  ArithmeticExceptionDevide by Zero"

• But in floating point data types (float & double) there is a way to represent undefined results .Both Float & Double classes contain a NaN constant to represent undefined results.We won't get any RuntimeException in floating point data types. 

          example:-                  

                                System.out.println(0.0/0);        output   NaN

                                System.out.println(-0.0/0);       output   NaN

 Points To Remember:-

1. ArithmeticException is a RuntimeException but not Compile Time Error.

2. ArithmeticException is possible in only integral types (byte,short,int,long).

3. ArithmeticException is caused by only two operators which are "/" & "%" only.

 

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