我如何获得BC（1）打印前导零？ [英] How do I get bc(1) to print the leading zero?

问题描述

我做这样的事情在一个Makefile如下：

I do something like the following in a Makefile:

echo "0.1 + 0.1" | bc

（在真实的文件的数量是动态的，当然）

(in the real file the numbers are dynamic, of course)

它打印 0.2 ，但我想它来打印 0.2 。

It prints .2 but I want it to print 0.2.

我想做到这一点，而不诉诸 SED 但我似乎无法找到如何获得 BC 打印为零。或者是 BC 只是没能做到这一点？

I would like to do this without resorting to sed but I can't seem to find how to get bc to print the zero. Or is bc just not able to do this?

推荐答案

您也可以诉诸awk将格式为：

You can also resort to awk to format:

 echo "0.1 + 0.1" | bc | awk '{printf "%f", $0}'

或使用awk本身做数学：

or with awk itself doing the math:

 echo "0.1 0.1" | awk '{printf "%f", $1 + $2}'

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