在线使用
一个建议的计算器。
- 实现基本的加减乘除、取余功能。
- 内置部分数学函数，如sin(),cos(),tan(),abs(),pow(),ln()等
- 内置部分常量，如pi、e等
- 能够处理圆括号运算，如：“（1+2+3-1）”。
- 能够处理重复加减符号，如：“-1++++2”。
- 在表达式出错时，能够大致指出错误位置！
- 实现添加常量和函数功能（如何添加函数，而避免执行危险代码！）
- 参照网页计算器，设计界面功能！
- 架构图和流程图？
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