5.3 String Formatting
A1: %g is same as "e" if exponent is greater than -4 or less than precision, "f" otherwise!
A2: In Chinese, left justification means '左对齐'. It adds some space in the right of a string.
A3: The width means the whole width of a string instead of before the decimal point!
Thank limodou very much to help me!
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