Representation of data, Boolean algebra, bitwise operations of C _15.09.14-chapter II (2.1.8)

1. The machine-level program treats the memory as a very large byte array called virtual memory . Each byte of the memory is identified by a unique number, called its address , and the collection of all possible addresses is called virtual address space . This is just a conceptual image that is presented to the machine. The actual implementation is to combine RAM, disk storage, special hardware, and operating system software to provide a seemingly uniform array of bytes to the program.

2, the lowest effective byte at the front, the small end way little endian. The highest effective byte is at the front, big endian. like 16-0x00003039.Small-end mode means:Big- endian means: xx

Representation of data, Boolean algebra, bitwise operations of C _15.09.14-chapter II (2.1.8)