go to previous page   go to home page   go to next page hear noise

Answer:

Yes.


Prefix Increment Operator

++counter   means increment the value before using it.
counter++   means increment the value after using it.

The increment operator ++ can be put in front of a variable. When this is done, it is a prefix operator. When it is put behind a variable it is a postfix operator. Both ways increment the variable. However:

When the increment operator is used as part of an arithmetic expression you must distinguish between prefix and postfix operators. 

int sum = 0;
int counter = 10;

sum = ++counter ;

System.out.println("sum: "+ sum " +
   counter: " + counter );

This program fragment will print: 

sum: 11  counter: 11

This fragment requires careful inspection:

The ++ operator is now a prefix operator.

counter is incremented before the value it holds is used.

The assignment statement is executed in two steps:

  1. Evaluate the expression on the right of the =
    • the value is 11 (because counter is incremented before use.)
  2. Assign the value to the variable on the left of the =
    • sum gets 11.

The next statement writes out: sum: 11 counter: 11


QUESTION 6:

Inspect the following code: 

int x = 99;
int y = 10;

y = ++x ; // prefix increment operator

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

What does this fragment write out?

go to previous page   go to home page   go to next page