You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

33 lines
1.1 KiB

This file contains ambiguous Unicode characters!

This file contains ambiguous Unicode characters that may be confused with others in your current locale. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to highlight these characters.

# **bc**
## 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
## 选项
```markdown
-i --interactive 强制进入交互式模式输入quit后回车退出此模式
-l --mathlib 定义使用的标准数学库
-q --quiet 不打印初始化信息
-s --standard non-standard bc constructs are errors
-w --warn warn about non-standard bc constructs
```
## 实例
```bash
echo "1.212*3" | bc # 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 "scale=2;3/8" | bc # 设定小数精度(数值范围)参数`scale=2`是将bc输出结果的小数位设置为2位
echo "obase=2;192" | bc # 进制转换,将数字192转换为2进制注意只能对数字进行进制转换,对应的进制有2,8,16,64
echo "$((0x2dec))" # 十六进制转十进制
echo "sqrt(1000/10) + 1" | bc -l
# 计算平方和平方根
echo "10^10" | bc
echo "sqrt(100)" | bc
```