> For the complete documentation index, see [llms.txt](https://hezhiqiang.gitbook.io/linux/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hezhiqiang.gitbook.io/linux/ming-ling/bc.md).

# bc

算术操作精密运算工具

## 补充说明

**bc命令** 是一种支持任意精度的交互执行的计算器语言。bash内置了对整数四则运算的支持，但是并不支持浮点运算，而bc命令可以很方便的进行浮点运算，当然整数运算也不再话下。

### 语法

```
bc(选项)(参数)
```

### 选项

```
-i：强制进入交互式模式；
-l：定义使用的标准数学库；
-w：对POSIX bc的扩展给出警告信息；
-q：不打印正常的GNU bc环境信息；
-v：显示指令版本信息；
-h：显示指令的帮助信息。
```

### 参数

文件：指定包含计算任务的文件。

### 实例

算术操作高级运算bc命令它可以执行浮点运算和一些高级函数：

```
echo "1.212*3" | bc 
3.636
```

设定小数精度（数值范围）

```
echo "scale=2;3/8" | bc
0.37
```

参数`scale=2`是将bc输出结果的小数位设置为2位。

进制转换

```
#!/bin/bash
abc=192
echo "obase=2;$abc" | bc
```

执行结果为：11000000，这是用bc将十进制转换成二进制。

```
#!/bin/bash
abc=11000000
echo "obase=10;ibase=2;$abc" | bc
```

执行结果为：192，这是用bc将二进制转换为十进制。

计算平方和平方根：

```
echo "10^10" | bc
echo "sqrt(100)" | bc
```


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