How to make sure number of digits remain same, padded if required

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Mohana Singh
Mohana Singh 2019-4-22
编辑： JULIEN BARBAUD 2019-4-22
I am assigning names in a loop of the form img000.png,img001.png and so on. I’m using strcat as follows:
%num=000 %strcat(‘img’,num2str(num),’.png’) %num=+1
How do I make the assignment of num so that it always remains 3 digits?

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JULIEN BARBAUD
JULIEN BARBAUD 2019-4-22
编辑：JULIEN BARBAUD 2019-4-22
Try to use something like
img_name=sprintf('img%03d',num)
instead of the strcat line

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