Page 159 - ComputerScience_Class_11

The output of the preceding program is as follows:

BlueJ: Terminal Window - Java
Options

Enter 1st number: 4
Enter 2nd number: 3
Sum: 7
Product: 12
Difference: 1
Quotient: 1.3333333333333333
Remainder: 1

The table given below shows the unary arithmetic operators which deal with one operand:
Operator Meaning Description Usage Example
Unary + Unary Plus It returns the same Used before the double val=45.76;
value. operand. then +val will be
The value of the +45.76 which is
operand remains same as 45.76.
the same.
Unary - Unary Minus It returns the value Used before the double val=-45.76;
with the reversed operand. then -val will be
sign. 45.76 as -(-45.76) is
45.76.
Unary ++ Unary Increment It is used to Prefix Unary int a=5, b;
increase the value Increment – b = ++a;
of the operand by Used before the Ans. 6
1. operand. (5+1=6)

It works the same Postfix Unary int a=5, b;
as val=val+1; Increment – Used b = a++;
after the operand. Ans. 5
Unary -- Unary Decrement It is used to Prefix Unary int a=6, b;
decrease the value Decrement – b = --a;
of the operand by Used before the
1. operand. Ans. 5
It works the same (6-1=5)
as val=val-1; Postfix Unary
Decrement – int a=6, b;
Used after the b = a --;
operand. Ans. 6
Let us understand the prefix and postfix increment and decrement operators with the help of some examples.

The prefix increment/decrement operator works on the principle of ‘Change Before Action’. Given below is the example
of the prefix increment operator. Here, an increment by 1 is executed first and then the value is used.

int a=5, b;
System.out.println("a: " +a);
b=++a;
System.out.println("a: " +a+ " and b: " +b);
Output:
a: 5
a: 6 and b: 6

Variables and Expressions 157