How use if else statement for floating point number

the total of white pixels are found as floating point number. I want to do something when the total white pixels exceed 4000, else do nothing.

But my code can't work. Can anyone help me?

BW2 is my binary image

numWhitePixels = sum(BW2(:));

fprintf('%f\n',numWhitePixels)

if numWhitePixels >= 4000
    
    se90 = strel('line',3,90);
    se0 = strel('line',3,0);
    BWsdil = imdilate(BW2,[se90 se0]);
    BW3 = imfill(BWsdil, 'holes');
    figure
    imshow(BW3)
    impixelinfo;
else
    figure
    imshow(BW2);
end

[Walter Roberson]

What value is getting printed out by the fprintf when you run the code?

[Quah Yi Hang]

ops, is my mistake, i set wrong number in the if statement

sorry about that.

thank for remind me