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("%-15s%03d%n", s1, x)
% : used as a formatter.
'-' : minus sign used for left indentation of the string.
15s : here 15 denotes the string's minimum field width 15.
'0' : pads the extra 0s in the integer.
3d : here 3 denotes integer's minimum field width 3.
%n : prints the new line.
Hope, this helps!