How use if else statement for floating point number

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Quah Yi Hang 2022-3-18

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https://ww2.mathworks.cn/matlabcentral/answers/1674564-how-use-if-else-statement-for-floating-point-number

编辑： Quah Yi Hang 2022-3-18

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