Xcode小數位數

Question

我想顯示一個數字值到最大小數位數。如果您沒有將浮動格式設置爲：

@"%.1f" 

然後它將顯示數字，例如： 1.000000。我想要的是該號碼將具有所需的最大小數位數，例如，

1不需要任何

1.5將需要1位小數

1.24將需要2位小數

是否有某種代碼格式數位小數的最大數量？

Answer 1

將「f」替換爲「g」。

從printf(3)：

gG  The double argument is converted in style f or e (or F or E for G conver- 
     sions). 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.