operator in java?

Operator concept in java?

It is used to perform an operation using operand, Operator is used to solving the mathematical,conditional, logical expression.

The operator will be defined as a method but it will be accessed using symbols.


For example, if we use the + operator then + has defined as +() in the Java library.


Type of Operator in Java:-

1)Unary Operator:-

  It will use single operand to perform operation,

  1.1) Increment      post a++ ,pre ++a    (a is the operand or variable)

  1.2) Decrement    Post  a-- ,Pre --a


Post Increment:-   First perform other operation then increase value

Pre Increment:-   First increase value then perform other operations.


Some Important example of Increment|Decrements:

class IncrDemo
{

   public static void main(String args[])
   {
      int a=2,b=3;
    //  b=a++;   //first assign,  then increment
       b=++a;   //first increase then assign
      System.out.println("a="+ a++ +" b= "+ ++b);     

   }


}

Example of Increment | Decrements:-

class IncrDemo
{

   public static void main(String args[])
   {
      int a=2,b=3;
      b= a++ + a++ + a++;
 //   9   2     3     4   5

      System.out.println("a="+ a +" b= "+ b);     

   }


}


Solve this problem for increment and decrements:-

class IncrDemo
{

   public static void main(String args[])
   {
      int a=2,b=3;
      b= a-- + ++a + a-- + a-- + --a;
  //  6   2           2     2      1       -1
      System.out.println("a="+ a +" b= "+ b);     

   }


}



..................................................................................................................

Binary Operator:-
It use a minimum two operands to perform the operation

Type of Binary Operator:-

2.1)  Arithmetic:-
        +,-,*,/,%

2.2)  Conditional:-

         <,>,<=,>=,!=

2.3)  Logical:-
     
         &&    It return true when both condition will be true
         ||       It return true when only one condition will be true
         ! :-        It is opposite of True Condition.

2.4)  Assignment:-

         It is used to assign the value of variable

        =  :-  Simple Assignment

        +=    a+=2  or a=a+2
        -=     a-=3   or a=a-3
        *=    a*=5   or a=a*5
        /=     a/=9    or a=a/9
        %=   a%=7  or a=a%7


2.5)  Comparison Operator:-  It is used to compare the value

2.5.1)   ==   :-  It return true when value is equal

2.5.2)  !=     :-   It return true when value is not equal

2.5.3)  equals():-  It is used to check equality of String Object




3)Ternary Operator:-  It provides complete expression to solve a condition-based problem using a single-line statement.
ternary has a condition with two different sub -statement

var = (condition) ? true : false

 
Example of Ternary Operator:-

WAP to check even number and odd number using a ternary operator?

class TernaryDemo

{

   public static void main(String args[])

   {

        int num=4;

        String s = num%2==0? "even" : "odd";

        System.out.println(s);

     

   }

}

WAP to check the greater number using two different numbers?

import java.util.Scanner;
class TernaryExample
{
   public static void main(String args[])
   {
      int a,b;
      Scanner sc = new Scanner(System.in);
      System.out.println("Enter First Number");
      a=sc.nextInt();
      System.out.println("Enter Second Number");
      b=sc.nextInt();
      String s = (a>b)?"a is greater ":"b is greater";
      System.out.println(s);
   


   }
 

}


ASSIGNMENT:-

note:-  not use if-else to solve any logic of the program, create a program using a ternary operator.

1)  WAP to check vowel and consonant using a ternary operator?

the logic of program:-

char ch='b';

String s = ch=='a' || ch=='e' || ch=='i' || ch=='o' || ch=='u'? "vowel" : "consonent";

System.out.println(s)

2) WAP to check leap year using a ternary operator?

the logic of program:-

 

int year=2002;

String s = (year%4==0) ? "Leap year " : "Not leap year";

System.out.println(s)

3) WAP to check the greatest number using three different numbers?

the logic of program:-

int a=10,b=25,c=12;

String s = (a>b && a>c)? " a is greater":(b>c?"b is greatest":"c is greater");

4) WAP to convert char into an upper case if it is lower case and lower case if it is in upper case?

class Convertcase

{

public static void main(String args[])

{

char ch = 'A';

int asc= ch;

char s = (asc>=65 && asc<=91)?(char)(asc+32):(char)(asc-32);

System.out.println(asc +" "+s);

}

}