MATLAB: ‘break’ in ‘while’ loop

breakwhile loop

Hi,

I have a 'while' loop inside a 'while' loop.

while
    %%%

    while
        %%%
        break
    end
    %%% statement 1
    %%% statement 2
end

I wonder the location of 'break' in this case would break only the inner 'while' loop or break even the outer 'while' loop?

In this case, will it still run 'statement 1' and 'statement 2'?

If not, how do I make sure it only break the inner loop and still run 'statement 1' and 'statement 2'?

Best Answer

From help break

In nested loops, break exits from the innermost loop only

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Try this:

again = true; % Flag for iterating the outer while loop again.
loopCounter1 = 1; % Count iterations to prevent infinite loop.  This is a "fail safe".

loopCounter2 = 1; % Count iterations to prevent infinite loop.  This is a "fail safe".
maxIterations = 9999; % Whatever is the most you ever expect.
while condition1 && again && loopCounter1 < maxIterations
  while condition2 && loopCounter2 < maxIterations
    if condition3
      % statements
      % increment counter
      break; % Breaks out of inner while loop only, loop #2.
    else
      % Here i want to break out without return to any while
      again = false;  % Make sure outer while loop does not iterate again.
      break;
    end
    % Increment counter

    loopCounter2 = loopCounter2 + 1;
  end
  % Increment counter
  loopCounter1 = loopCounter1 + 1;
end

MATLAB: How does ‘break’ work

The "break" statement breaks out of the "innermost" loop that it is inside of. In your code above, it will break out of the for j=1:50 loop and start executing at the next line after the "j loop" end statement. This next statement happens to be the end statement in an else clause. Since there is no "i loop" code after this end statement other than the "i loop" end statement, this break will effectively cause the for i=1:50 loop to skip to the next i also.

Best Answer

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MATLAB: How does ‘break’ work

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