Answer Posted / shivam chaurasia

The %*d in a printf allows you to use a variable to control the field width, along the lines of:
int wid = 4;
printf ("%*d
", wid, 42);

output,...
..42


if the form is like this...
printf ("%*d %*d
", a, b);
is undefined behaviour as per the standard, since you should be providing four arguments after the format string, not two (and good compilers like gcc will tell you about this if you bump up the warning level). From C11 7.20.6 Formatted input/output functions:

If there are insufficient arguments for the format, the behavior is undefined.

It should be something like:

printf ("%*d %*d
", 4, a, 4, b);


check this link for extra detail....
http://www.cplusplus.com/reference/cstdio/printf/

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