What variables should i choose inside the loop?

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Suppose I have NN number of images named img1 to imgNN...what variables should I choose to display all the images inside the loop..
NN = 40;
for ii = 1:NN
figure;
imshow(img(NN));
axis on;
end
I tried this but its not working...I am facing trouble choosing the variable..any help is appreciated

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Walter Roberson
Walter Roberson 2015-7-24
编辑:Walter Roberson 2015-7-24
NN = 40;
for ii = 1:NN
figure;
thisimgname = sprintf('img%d.jpg', ii);
img = imread(thisimgname);
imshow(img);
axis on;
end

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