http://benji3up2kxewkqfcq7buxk2xd6zwy3zggnurkrm3l4cvwy2iipvyyad.onion/mirrors/gmpdoc/Formatted-Output-Strings.html
GLIBC style ‘ ' ’ is only for the
standard C types (not the GMP types), and only if the C library supports it. 0 pad with zeros (rather than spaces) # show the base with ‘ 0x ’, ‘ 0X ’ or ‘ 0 ’ + always show a sign (space) show a space or a ‘ - ’ sign ' group digits, GLIBC style (not GMP types) The optional width and precision can be given as a number within the format
string, or as a ‘ * ’ to take an extra parameter of type int , the
same as the standard printf .