naming file with count

FileName = fullfile('C:\Users\User\Desktop\1cm circle cropped 0.27',sprintf('circle_cropped_%d.jpg',count));

The code I use would give file name (circle_cropped_1.jpg, circle_cropped_2.jpg, circle_cropped_3.jpg.........)

How to name the images with "circle_cropped_001.jpg, circle_cropped_002.jpg, circle_cropped_003.jpg.........................."

And how to move the counting number? to be "001_circle_cropped.jpg, 002_circle_cropped.jpg, 003_circle_cropped.jpg......................."

Answer 1

[Adam Danz]

sprintf('circle_cropped_%03d.jpg',count) 
%                        ^^