对比系统自带计算器，我们做了一款可能更好用的计算器。主要特点如下：
1.支持记简易计算和科学计算
2.计算步骤和计算过程可查看
3.完美支持iPad，iPad可以横竖屏切换
4.80款壁纸任意选择
5.支持汉语大写显示
6.针对高分辨率做了优化
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"Privacy Agreement" https://www.jianshu.com/p/3ce508010a23
"Member Service Agreement" https://www.jianshu.com/p/40d4f8cf7b90