Calculator for Pad

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

Subscription instructions:
—1 subscription option to choose from. Our standard subscription options are:
Subscribe for1week /1month/1year
—The subscription fee will be paid through the credit card attached to your iTunes account.
-Unless your subscription is cancelled at least 24 hours before the end of the current period, your subscription will be automatically renewed.
—You can manage your subscriptions on your account. You can cancel your subscription or trial at any time by going to the iTunes account settings and canceling the subscription, otherwise it will automatically renew.
—The account will be charged for renewal within 24 hours before the end of the current period, and you will not be able to cancel the subscription within the validity period.
—When purchasing a premium subscription during the free trial period, any unused portion of the free trial period (if provided) will be confiscated.
—For more information, please refer to our "Privacy Agreement" and "Member Service Agreement"
"Privacy Agreement" https://www.jianshu.com/p/3ce508010a23
"Member Service Agreement" https://www.jianshu.com/p/40d4f8cf7b90