==================================== Exercise 3.6 - itoa with field width ==================================== Question ======== Write a version of itoa that accepts three arguments instead of two. The third argument is a minimum field width; the converted number must be padded with blanks on the left if necessary to make it wide enough. .. literalinclude:: cprogs/ex_3.6_itoa-3.c :language: c :tab-width: 4 Explanation =========== Note: For negative numbers the negative sign is written close to the number instead of before the padded width. This is ``itoa`` conversion with padding. We specify the width of the number we want in ``w`` and as before, we proceed with ``itoa``, wherein extract the unit digit (n ``% 10``), convert it to character and store it in a character array. If it were a negative number we store the sign too. We keep track of number of digits in the number in a variable, ``i`` and for the remaining digits, for ``i < w``, we append the space character " ". We reverse the string thus constructed for our result. Visualize It ============ .. raw:: html Run It ====== .. raw:: html