Basic Calculations vs Recursion

This is an app to improve the calculation ability of addition, subtraction, multiplication and division. Major function: 1. Addition, subtraction, multiplication and division - step up of difficulty 2. Offline printing - mix and match 3. Online practice - flexible use 4. Calculation results - chart statistical analysis This app can be used offline and is suitable for iPhone and iPad. When connected to the Internet, data can be synchronized between iPhone and iPad. With Apple's cloudkit service, you don't need to enter your user name, password, mobile phone verification code, etc. to protect your privacy. It can also scan A4 documents and export PDF; it can also scan ID cards and other documents to export PDF. Using Apple's latest swift programming language and Apple's own camera capture technology, the automatic recognition rate of ID size is improved. [unsubscribe automatically] If you purchase a continuous package year (month) item, unless you cancel the order at least 24 hours before the end of the current billing cycle, the item will be automatically renewed, and your account will charge a renewal fee within 24 hours before the end of the current billing cycle. You unsubscribe: "Settings" - "iTunes Store and app store" - "select Apple ID" - "view Apple ID" - "subscribe" - "unsubscribe" 【Privacy policy】 https://www.jianshu.com/p/7a76a010e3b9 【Terms of Use】 https://www.jianshu.com/p/ce6ea1a69bc5

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