Assignment and Unary Operators.

In this article,Assignment and Unary Operators are explained in detail with examples.We are going to learn about Assignment operators with an example.

This operator is used to assign to value to a variable. It is "=".

Ex

a=10;

b=20;

sum=a+b;

Compound Assignment.       (From topic Assignment and Unary Operators)

If assignment operator is used with basic arithmetic operators then we get compound assignments.

Operator	Compound assignment
+=	a+=b =>a=a+b
-=	a-=b =>a=a-b
*=	a*=b =>a=a*b
/=	a/=b =>a=a/b
%=	a%=b =>a=a%b

Ex

//Program related to Assignment and Unary Operators-compound assignment

class CompoundAssignment

{

public static void main(String args[])

{

int a,b;

int sum;

a=10;

b=20;

sum=a+b;

System.out.println("Sum is: "+sum);

System.out.println("A+=B is: "+(a+=b));

System.out.println("A-=B is: "+(a-=b));

System.out.println("A*=B is: "+(a*=b));

System.out.println("A/=B is: "+(a/=b));

System.out.println("A%=B is: "+(a%=b));

}

}

Output

Sum is: 30

A+=B is: 30

A-=B is: 10

A*=B is: 200

A/=B is: 10

A%=B is: 10

                            To get code file use me.

Unary Operator

These operators take one value or operand to perform the operation.They are

++ (Increment) => increase the value by 1.

--   (Decrement) => decreases the value by 1.

-  (Unary minus)=> negation of given value.

++ and -- is used in two ways.

Pre-operation Ex: ++a, --b

Post-operation Ex: a++, b++

Note

Whether pre-operation/post-operation, the value is just increased by one. Similarly, pre-decrement/ post-decrement value is just decreased by one.

However, the utility changes if assign to an another variable. (From topic Assignment and Unary Operators)

case 1: a=10,b=20;

             b=++a;

           first increment 'a' and assign a value to b (b=11).

case2: a=10,b=20;

            b=a++;

            assign 'a' to 'b' and then increment 'a' (b=10).

Unary minus: It is simply a negative of a number.

                       Ex: a=10;

                              a=-10;

Ex

// program related to Assignment and Unary Operators- Increment,Decrement.

class IncrementDecrement

{

public static void main(String args[])

{

int x=10,y=20;

System.out.println("x is: "+x);

System.out.println("y is: "+y);

System.out.println("++x is: "+(++x));

System.out.println("y++ is: "+(y++));

System.out.println("x is: "+x);

System.out.println("y is: "+y);

System.out.println("--x is: "+(--x));

System.out.println("y-- is: "+(y--));

System.out.println("x is: "+x);

System.out.println("y is: "+y);

x=10;y=20;

y=x++;

System.out.println("x is; "+x);

System.out.println("y is; "+y);

x=10;y=20;

y=++x;

System.out.println("x is: "+x);

System.out.println("y is: "+y);

x=10;y=20;

x=-x;

y=-y;

System.out.println("x is: "+x);

System.out.println("y is: "+y);

}

}

Output

x is: 10

y is: 20

++x is: 11

y++ is: 20

x is: 11

y is: 21

--x is: 10

y-- is: 21

x is: 10

y is: 20

x is; 11

y is; 10

x is: 11

y is: 11

x is: -10

y is: -20

                              To get the code file use me.

Continue to next topic Ternary and Bitwise operators.

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