Java 2

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Java Operators

The operators in Java are like the following : 1.  Arithme*c operators . 2.  Rela*onal operators. 3.  Logical operators. 4.  Assignment operators.

Arithmetic Operators

Operator Descrip-on Example

+ Addi-on – Adds values on either side of the operator A + B will give 30 -‐ Subtrac-on – Subtracts right hand from le? hand A - B will give -10 * Mul-plica-on -‐ Mul-plies values on either side of the operator A * B will give 200 / Division -‐ Divides le? hand operand by right hand operand B / A will give 2

% Modulus -‐ Divides le? hand operand by right hand operand and returns remainder B % A will give 0

++ Increment -‐ Increases the value of operand by 1 B++ gives 21 -‐-‐ Decrement -‐ Decreases the value of operand by 1 B-- gives 19

Arithmetic operators are used in mathematical expressions in the same way that they are used in algebra. The following table lists the arithmetic operators: Assume integer variable A holds 10 and variable B holds 20, then:

public static void main(String[] args) { int A , B ; A=10 ; B=20 ; System.out.println ( A + B ) ; }

010101010101010101010101

30

Addition Operator

A=10 B=20

public static void main(String[] args) { int A , B ; A=10 ; B=20 ; System.out.println ( A - B ) ; }

010101010101010101010101

-10

Subtraction Operator

A=10 B=20

public static void main(String[] args) { int A , B ; A=10 ; B=20 ; System.out.println ( A * B ) ; }

010101010101010101010101

200

Multiplication Operators

A=10 B=20

public static void main(String[] args) { int A , B ; A=10 ; B=20 ; System.out.println ( B / A ) ; }

010101010101010101010101

2

Divition Operator

A=10 B=20

public static void main(String[] args) { int A , B ; A=10 ; B=20 ; System.out.println ( B % A ) ; }

010101010101010101010101

0

Modulus Operator

A=10 B=20

public static void main(String[] args) { int A , B ; A=10 ; B=20 ; System.out.println ( + + B ) ; }

010101010101010101010101

Increment Operator

A=10 B=20


010101010101010101010101

Increment Operator

A=10 B=21


010101010101010101010101

Increment Operator

A=10 B=21

21

public static void main(String[] args) { int A , B ; A=10 ; B=20 ; System.out.println (B + +) ; }

010101010101010101010101

20

Increment Operator

A=10 B=20

public static void main(String[] args) { int A , B ; A=10 ; B=20 ; System.out.println (B + +) ; }

010101010101010101010101

20

Increment Operator

A=10 B=21

public static void main(String[] args) { int A , B ; A=10 ; B=20 ; System.out.println ( - - B) ; }

010101010101010101010101

Decrement Operator

A=10 B=20


010101010101010101010101

Decrement Operator

A=10 B=19


010101010101010101010101

Decrement Operator

A=10 B=19

19

public static void main(String[] args) { int A , B ; A=10 ; B=20 ; System.out.println ( B - - ) ; }

010101010101010101010101

Decrement Operator

A=10 B=20


010101010101010101010101

20

Decrement Operator

A=10 B=20


010101010101010101010101

20

Decrement Operator

A=10 B=19

Relational Operators

operator Descrip-on Example

== Checks if the values of two operands are equal or not, if yes then condi-on becomes true. (equal ) (A == B) is not true.

!= Checks if the values of two operands are equal or not, if values are not equal then condi-on becomes true. ( not equal ) (A != B) is true.

> Checks if the value of le? operand is greater than the value of right operand, if yes then condi-on becomes true. ( greater than) (A > B) is not true.

< Checks if the value of le? operand is less than the value of right operand, if yes then condi-on becomes true. ( Less than) (A < B) is true.

>= Checks if the value of le? operand is greater than or equal to the value of right operand, if yes then condi-on becomes true. (A >= B) is not true.

<= Checks if the value of le? operand is less than or equal to the value of right operand, if yes then condi-on becomes true. (A <= B) is true.

There are following relational operators supported by Java language: Assume variable A holds 10 and variable B holds 20 , then:

public static void main(String[] args) { int x , y ; x = 10 ; y = 20 ; System.out.println ( x = = y ) ; }

010101010101010101010101

False


x = 10 y = 20

public static void main(String[] args) { int x , y ; x = 10 ; y = 20 ; System.out.println ( x ! = y ) ; }

010101010101010101010101

True


x = 10 y = 20

public static void main(String[] args) { int x , y ; x = 10 ; y = 20 ; System.out.println ( x > y ) ; }

010101010101010101010101

False


x = 10 y = 20

public static void main(String[] args) { int x , y ; x = 10 ; y = 20 ; System.out.println ( x < y ) ; }

010101010101010101010101

True


x = 10 y = 20

public static void main(String[] args) { int x , y ; x = 10 ; y = 20 ; System.out.println ( x > = y ) ; }

010101010101010101010101

False


x = 10 y = 20

public static void main(String[] args) { int x , y ; x = 10 ; y = 20 ; System.out.println ( x < = y ) ; }

010101010101010101010101

True


x = 10 y = 20

Logical Operators


&& Called Logical AND operator. If both the operands are non-‐zero, then the condi-on becomes true. (A && B) is false.

|| Called Logical OR Operator. If any of the two operands are non-‐zero, then the condi-on becomes true.

(A || B) is true.

! Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condi-on is true then Logical NOT operator will make false.

!(A && B) is true.

The following table lists the logical operators: Assume Boolean variables A holds true and variable B holds false , then:

public static void main(String[] args) { int test = 6 ; If ( test = = 9 ) { System.out.println( “ yes ” ) ; } else { System.out.println( “ this is else ” ) ; } }

010101010101010101010101

this is else

If Statement

test = 6

public static void main(String[] args) { int boy , girl ; boy = 18 ; girl = 68 ; If ( boy > 10 ) { System.out.println(“you can enter”) ; }else{ System.out.println(“you are too young”) } }

010101010101010101010101

You can enter

Logical Operators

boy = 18 girl = 68

public static void main(String[] args) { int boy , girl ; boy = 18 ; girl = 68 ; If ( boy > 10 && girl < 60 ) { System.out.println(“you can enter”) ; }else{ System.out.println(“you are too young”); } }

010101010101010101010101

You are too young

Logical Operators

boy = 18 girl = 68

public static void main(String[] args) { int boy , girl ; boy = 18 ; girl = 68 ; If ( boy > 10 | | girl < 60 ) { System.out.println(“you can enter”) ; }else{ System.out.println(“you are too young”); } }

010101010101010101010101

You can enter

Logical Operators

boy = 18 girl = 68

public static void main(String[] args) { int boy , girl ; boy = 18 ; girl = 68 ; If (!( boy > 10 && girl < 60 )) { System.out.println(“you can enter”) ; }else{ System.out.println(“you are too young”); } }

010101010101010101010101

you can enter

Logical Operators

boy = 18 girl = 68

public static void main(String[] args) { int age ; age = 3 ; Switch( age ) { case1 : System.out.println(“you can crawl”) ; break ; case2 : System.out.println(“you can talk”) ; break ; case3 : System.out.println(“you can get in trouble”) ; break ; default : System.out.println(“I don’t know how old are you”) }

010101010101010101010101

you can get in trouble

Logical Operators

age= 3

Assignment Operators


= Simple assignment operator, Assigns values from right side operands to le? side operand

C = A + B will assign value of A + B into C

+= Add AND assignment operator, It adds right operand to the le? operand and assign the result to le? operand

C += A is equivalent to C = C + A

-‐= Subtract AND assignment operator, It subtracts right operand from the le? operand and assign the result to le? operand

C -‐= A is equivalent to C = C -‐ A

*= Mul-ply AND assignment operator, It mul-plies right operand with the le? operand and assign the result to le? operand

C *= A is equivalent to C = C * A

/= Divide AND assignment operator, It divides le? operand with the right operand and assign the result to le? operand

C /= A is equivalent to C = C / A

%= Modulus AND assignment operator, It takes modulus using two operands and assign the result to le? operand

C %= A is equivalent to C = C % A

public static void main(String[] args) { int a , b , c ; a = 10 ; b = 20 ; c = 0 ; c = a + b ; System.out.println (c) ; }

010101010101010101010101

30


a = 10 b = 20 c = 0

public static void main(String[] args) { int a , b , c ; a = 10 ; b = 20 ; c = 0 ; c + = a ; System.out.println (c) ; }

010101010101010101010101

10


a = 10 b = 20 c = 0

public static void main(String[] args) { int a , b , c ; a = 10 ; b = 20 ; c = 0 ; c - = a ; System.out.println (c) ; }

010101010101010101010101

-10


a = 10 b = 20 c = 0

public static void main(String[] args) { int a , b , c ; a = 10 ; b = 20 ; c = 0 ; c*=a ; System.out.println (c) ; }

010101010101010101010101

0


a = 10 b = 20 c = 0

public static void main(String[] args) { int a , b , c ; a = 10 ; b = 20 ; c = 0 ; c/=a ; System.out.println (c) ; }

010101010101010101010101

0


a = 10 b = 20 c = 0

public static void main(String[] args) { int a , b , c ; a = 10 ; b = 20 ; c = 0 ; c%=a ; System.out.println (c) ; }

010101010101010101010101

0


a = 10 b = 20 c = 0

Assignment

 أكتب برنامج يقوم بحساب مجموع الدرجات التالية : ٣٠ ، ٢٠ ، ٢٥. -

 أكتب برنامج يقوم بمعرفة باقي قسمة : ٧/٢ . -

 أكتب برنامج يقوم بمعرفة إذا كان الطالب ناجح او راسب . -

 أكتب برنامج يقوم بطباعة قيمة ( -X . اوال ً ثم بعد ذلك تزويد هذه القيمة بــ ( ١) في الذاكرة (

 أكتب برنامج يقوم بنقص قيمة ( -A) بـ (١) من الذاكرة ، ثم بعد ذلك طباعة قيمة (A . (

 اكتب برنامج يقوم بطباعة ( -Excellent )وطباعة (٩٠ =< X ) إذا كان ( Very Good إذا(

) إذا Fail )إذا كان ( X >= ٥٠) وطباعـــــــــــــــة ( Goodكان ( X >= ٨٠ ) وطباعة (

.(٥٠ => X ) كان

Education

Java 2