Question

我知道如何做X量的前导零，我知道如何做X小数点。但是，我该怎么做呢？

我希望有4个前导零到小数精度2：0000.00。因此43.4将是0043.40

Answer 1

试试这个printf（C，Perl，PHP）格式字符串：

"%07.2f"

Answer 2

以下是您需要的代码：

float myNumber = 43.4;
DecimalFormat formatter = new DecimalFormat("0000.00"); //use # for optional digits instead of 0
System.out.println(formatter.format(myNumber));

Answer 3

Java：使用Formatter类。预期用法示例：

StringBuilder sb = new StringBuilder();
// Send all output to the Appendable object sb
Formatter formatter = new Formatter(sb, Locale.US);

// Explicit argument indices may be used to re-order output.
formatter.format("%4$2s %3$2s %2$2s %1$2s", "a", "b", "c", "d")
// -> " d  c  b  a"

// Optional locale as the first argument can be used to get
// locale-specific formatting of numbers.  The precision and width can be
// given to round and align the value.
formatter.format(Locale.FRANCE, "e = %+10.4f", Math.E);
// -> "e =    +2,7183"

// The '(' numeric flag may be used to format negative numbers with
// parentheses rather than a minus sign.  Group separators are
// automatically inserted.
formatter.format("Amount gained or lost since last statement: $ %(,.2f",
                balanceDelta);
// -> "Amount gained or lost since last statement: $ (6,217.58)"

printf如何使用前导零进行浮点运算

3 个答案: