The overall syntax of a conversion specification is:44Please respect copyright.PENANA4vuE9CICLe
%[$][flags][width][.precision][length modifier]conversion
参考资料:44Please respect copyright.PENANA3JjsyZr7LK
https://man7.org/linux/man-pages/man3/printf.3.html
44Please respect copyright.PENANAaKI75HpUgd
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