Program 5.8: += in a for loop

However what do you do when you want to increment not by one but by two? or three? or fifteen? You could of course write i = i + 15, but this also happens frequently enough that there's another shorthand for the general add and assign operation, +=. You would normally write this as i += 15. Program 5.8 uses += to count from 0 to 20 by twos.

class CountToTwentyByTwos  {

  public static void main (String args[]) {
    int i;
    for (i=0; i <=20; i += 2) {  
      System.out.println(i);
    } 
    System.out.println("All done!");

 } //main ends here

}

Here's the output:

% javac CountToTwentyByTwos.java
% java CountToTwentyByTwos
0
2
4
6
8
10
12
14
16
18
20
All done!
%

This Chapter
Examples
Home