#!/bin/bash
#Program:
# 计算pi的值，输入要精确到小数多少位
#History:
# 2024/07/12 LouisFonda<yigencong@yahoo.com> first release

echo -e "**计算pi\n**"
read -p "请输入你要保留几位小数？：" scale
echo "scale=${scale};4*a(1)" | bc -lq