采用IOS重力感应技术实现手机设备左右倾斜判断自然数N为质数还是合数；不在需要手指手动点击屏幕。
玩法：打开程序后会产生正整数N，若N为质数将手机设备向左倾斜，若N为合数将手机设备向右倾斜。

IOS gravity sensing technology is used to realize the left and right tilt of mobile devices to judge whether the natural number n is prime or sum; no need to click the screen manually.
Play method: after opening the program, a positive integer n will be generated. If n is the prime number, tilt the mobile device to the left; if n is the sum number, tilt the mobile device to the right.

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