The overall syntax of a conversion specification is:45Please respect copyright.PENANA6ysLJ1X8Mn
%[$][flags][width][.precision][length modifier]conversion
参考资料:45Please respect copyright.PENANAWFGnFGgmuT
https://man7.org/linux/man-pages/man3/printf.3.html
45Please respect copyright.PENANAv8yPJ8ZRf8
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