问题描述
当我使用％G 的格式说明在的printf（），有时四舍五入高达2小数点后的地方，有时高达3个地方，someimes高达4个地方......怎么这样做？
While I'm using %g as format specifier in printf(), sometimes it rounds up upto 2 places after decimal point, sometimes upto 3 places , someimes upto 4 places...how it does so?
其实，我们应该用％G 的而不是％F 或％E 浮点数？
Actually where we should use %g instead of %f or %e for floating point numbers?
推荐答案
的％G 格式说明做它的舍入就像％F 会做，但如果％F 将导致 4.234000 ，那么 ％G 将省略尾随零和打印 4.234 。
The %g format specifier does its rounding just like %f would do, but if %f would result in 4.234000, then %g will omit the trailing zeros and print 4.234.
％G 时，最有意义的是一些数字印刷作为 12345.6 ，而一个稍微大一些会>打印为 1.235e04
%g should be used when it makes the most sense in your output format that some numbers are printed as 12345.6, while a slightly bigger number would be printed as 1.235e04.
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