16位有符号整数除法，将商并入移位后的被除数，节省资源。-16-bit signed integer division, will shift into business after the dividend, saving resources.

根据不同的计费方式和通话时间进行通话费用的计算，选出合理的话费区间和选择业务方式-According to different billing methods and talk time calculation of the cost of a call to elect a reasonable range and choice business approach calls