Class IX - Computer Applications - Chapter 5: Operators in Java

                 Class IX - Computer Applications

 Chapter 5: Operators in Java

Content 

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1. Operators and its forms

2. Operators -:Types

3. Operators - Precedence and Associativity

4. Operators - The new Operator

5. Operators - The dot(.) Operator

6. Operators - Expressions

7. Operators - Type Conversions

8. Operators - Output using println and print    

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 Operators - Definition

  Operators are the symbols(+, -, *, /, %, &&, ||, !, >, <, <=,>=, ==, and ! =) which are used for doing calculations. 

 Operators - Types 
    Operators are of following types:-

• Mathematical Operators
• Unary                                      
• Example int x=10, x++ ++x x-- or --x
• Binary                                     
• Example int x=10,y=5, z;  z=x+y, z=x-y
  
• Ternary                                   
• Example int res=(x>y)?60:70;
  
• Relational Operators
• > More than                            
• Example int x=10, if(x>7)
• < Less than                              
• Example int x=10, if(x<7)
• >= More than Equal to            
•  Example int x=10, if(x>=7)
• <= Less than Equal to             
•  Example int x=10, if(x<=7)
• == Equal to                             
• Example int x=10, if(x==7)
• != Not Equal to                        
• Example int x=10, if(x!=7)
• Logical Operators
• Logical && (AND)
• Logical || (OR)
• Logical ! (NOT)
  

Operators - Precedence and Associativity

Category	Operators	Associativity
Postfix	++ - -	Left to right
Unary	+ - ! ~ ++ - -	Right to left
Multiplicative	* / %	Left to right
Additive	+ -	Left to right
Shift	<< >>	Left to right
Relational	< <= > >=	Left to right
Equality	== !=	Left to right
Bitwise  AND	&	Left to right
Bitwise XOR	^	Left to right
Bitwise OR	|	Left to right
Logical AND	&&	Left to right
Logical OR	||	Left to right
Conditional	?:	Right to left
Assignment	= += -= *= /= %=>>= <<= &= ^= |=	Right to left

Operators - The new Operator

The new Operator used to create object of a class.
              Example: Employee e = new Employee();
 

Operators - The dot(.) Operator

The dot(.) Operator used to access methods of a class

               Example:  e.CalSalary(); 

 

Operators - Expressions
                An expression is a combination of constants, variables, operators and methods calls, which are constructed according to the syntax of the language.

Types of Expressions

• Arithmetic Expressions
• String Expressions
• Boolean(or Logical) Expressions   

Operators - Type Conversions
                A types conversion is a process of converting a value of one data type to another data type.
                Types of Conversions

• Implicit Conversions

                                     When conversion done automatically  

•  Explicit Conversions                    

                       When conversion done forcefully

Example: 

int x, y, z;
float  p=7.6F;

 Operators - Output using println and print   

 Logical

Operators - Very Short Answer Type Questions

Operators - Short Answer Type Questions

Operators - Programming Based Questions