虽然使用<条码>%g作为<条码>查询格式的缩略语()的Im, 有时在解答点后升至2个,有时甚至升至3个, 而有些imes高至4个地点......
实际上,我们应当使用<条码>%g而不是<条码>%f或<条码>%。
<%g Format specifier do its Rounding only as %f 但如果<代码>%f将产生4.234000,则%g将忽略“0”和“4.234。
%g automatically flips between using %e and %f depending on the value, in an attempt to display as much information as possible, in the same way as hand-held calculators do.
Also, with %g trailing zeroes and decimal point are not included.
For the %f conversion, the “precision” is the number of digits after the decimal point, while for %g it is the number of significant digits.
The default precision is 6 in both cases.
http://linux.die.net/man/3/printf”rel=“nofollow”> 印本
"The double argument is converted in style f or e (or F or E for G conversions). The precision specifies the number of significant digits. If the precision is missing, 6 digits are given; if the precision is zero, it is treated as 1. Style e is used if the exponent from its conversion is less than -4 or greater than or equal to the precision. Trailing zeros are removed from the fractional part of the result; a decimal point appears only if it is followed by at least one digit."
我不说“RTFM”,但你也许会发现你在控制精确度和长度的手册章节中重新审视了什么。
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