Difference between the prefix and postfix forms - Java

Explain the difference between the prefix and postfix forms of the increment operator

The prefix operator ++ adds one to its operand / variable and returns the value before it is assigned to the variable. In other words, the increment takes place first and the assignment next.

The postfix operator ++ adds one to its operand / variable and returns the value only after it is assigned to the variable. In other words, the assignment takes place first and the increment next.
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prefix and postfix operator in java
class forLoop
{
public static void main(String args[])
{

for(int a=0;a<=20;a++)

{
System.out.println("value of a:"+a); //VALUE=0

System.out.println("\t "+ ++a); //preFix Increment Operator used //VALUE=1

System.out.println("\t "+a++); //postFix Increment Operator used //VALUE=1

System.out.println("\t "+a); //VALUE=2


System.out.println("\n");
}

}
}

*************OUTPUT****************

value of a:0
1
1
2


value of a:3
4
4
5


value of a:6
7
7
8


value of a:9
10
10
11


value of a:12
13
13
14


value of a:15
16
16
17


value of a:18
19
19
20
Arun Singh 09-10-2013

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