使用printf打印浮点数时有额外的前导零?

2022-01-09 00:00:00 floating-point c formatting printf c++

我希望能够使用 printf 编写一个如下所示的时间字符串:1:04:02.1 hours.
当我尝试写这样的东西时:

I'd like to be able to write a time string that looks like this: 1:04:02.1 hours using printf.
When I try to write something like this:

printf("%d:%02d:%02.1f hours ", 1, 4, 2.123456);

我明白了:

1:04:2.1 hours

是否可以在浮点格式中添加前导零?

Is it possible to add leading zeros to a float formatting?

推荐答案

使用 %f 格式说明符，2"被视为最小字符数，而不是位数在小数点之前.因此，您必须将其替换为 4 才能获得两位前导数字 + 小数点 + 一位小数.

With the %f format specifier, the "2" is treated as the minimum number of characters altogether, not the number of digits before the decimal dot. Thus you have to replace it with 4 to get two leading digits + the decimal point + one decimal digit.

printf("%d:%02d:%04.1f hours ", 1, 4, 2.123456);

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