How to convert and display numbers into strings

INTRODUCTION: Hi, I make a string concatenation using alpha and numerical characters

['K=' num2str(k)]

Thus, using the loop below

for k=998:1001
['K=' num2str(k)]
end;

I obtain the following strings K=998, K=999, K=1000, K=1001

which I use elsewhere.

PROBLEM/WISH: I would like TO ADD ONE ZERO BEFORE the number as below:

K=0998, K=0999, K=1000, K=1001

and I would like TO ADD TWO ZEROS if k<100, and THREE ZEROS if k<10

I wonder if someone could help to fix this problem.

Thank you Emerson

Answer 1

[David Sanchez]

for k=1:1000
    if k<10
        tmp_str = 'K=000';
    elseif k<100
        tmp_str = 'K=00';
    elseif k>=100 && k<1000
        tmp_str = 'K=0';
    else
        tmp_str = 'K=';
    end
    [tmp_str num2str(k)]
end

[Emerson De Souza]

Thank you David, your suggestion fixed the problem.