20 General utilities library [utilities]

Forces the field to be aligned to the start of the available space.

This is the default for non-arithmetic types, charT, and bool, unless an integer presentation type is specified.

Forces the field to be aligned to the end of the available space.

This is the default for arithmetic types other than charT and bool or when an integer presentation type is specified.

Forces the field to be centered within the available space by inserting $\lfloor \frac{n}{2}\rfloor$ characters before and $\lceil \frac{n}{2}\rceil$ characters after the value, where n is the total number of fill characters to insert.