C语言中的很多运算基本是以字节为单位进行的，但有时为了节约内存空间，或很多系统程序中要求在比特位级别进行运算处理，很荣幸，C语言提供了这样的位运算特性。(A lot of operation in the C language is the basic byte as a unit, but sometimes in order to save memory space, or many system program requirements for processing, the bit level privilege, C language provides a calculation of such characteristics.)