How to use a while loop condition without initializing a boolean twice?

Question

What is the best way to simply this expression so that I don't have to set colFinished twice? (colFinished has to be reset to false in each run of the outer loop)

boolean colFinished = false;
    for (int c = 0; c < SIZE; c += 1) {
        colFinished = false;
        while (!colFinished) {
            for (int r = 1; r < SIZE; r++) {
            ...

"colFinished has to be reset to false in each run of the outer loop" - Why? There is no apparent reason for that. — Seelenvirtuose
– Seelenvirtuose, Commented Sep 22, 2014 at 7:48
If you want the boolean flag colFinished because you wish to break from the inner for-loop, you might want to consider using a label. — Jae Heon Lee
– Jae Heon Lee, Commented Sep 22, 2014 at 8:01
@Seelenvirtuose I haven't made that clear in the little snippet I gave you, but each run of the outer loop is a different column, so I reset my check on whether the column is finished. — rosstex
– rosstex, Commented Sep 22, 2014 at 8:05

blackSmith · Accepted Answer · 2014-09-22 07:49:07Z

2

If you have no use of colFinished outside the for loop, try :

for (int c = 0; c < SIZE; c += 1) {
    boolean colFinished = false;
    ...............

Else I think there is no other way.

answered Sep 22, 2014 at 7:49

blackSmith

3,1743 gold badges23 silver badges38 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

null Over a year ago

A good compiler would optimize your code, because you declare colFinished in the loop. Declare it outside and just set it false inside the loop.

blackSmith Over a year ago

@null : yes. but I think OP is not aware of this type of syntax. That's why such a question is being asked.

Seelenvirtuose Over a year ago

@null If the variable has only meaning inside the loop, then I highly advise for declaring it inside the loop. This is all about intention. Let the compiler do its work. As a programmer you should write readable code that carries your intention!

DirkNM · Accepted Answer · 2014-09-22 07:52:54Z

0

You can declare your variable inside the first for-loop:

for (int c = 0; c < SIZE; c += 1) {
    boolean colFinished = false;
    while (!colFinished) {
        for (int r = 1; r < SIZE; r++) {
        ...

answered Sep 22, 2014 at 7:52

DirkNM

2,66417 silver badges22 bronze badges

Collectives™ on Stack Overflow

How to use a while loop condition without initializing a boolean twice?

2 Answers 2

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related