Memory analysis of "Learning notes" and "C language" variables

The memory in the computer is the storage space in bytes . Each byte of memory has a unique number, which is called an address . As if the hotel is a room unit, each room has a unique room number, we can find the corresponding room according to room number.

1. Storage of variables

The number of bytes consumed by 1> is related to the type, and also to the compiler environment

2> Variable Instance

int B = 10;

int a = 134;

* Memory from large to small addressing

* Only binary forms are stored

* Each variable has an address: the address of the first byte is the address of the variable.

3> two ways to view memory addresses:%x and%p

4> viewing the binary form of integers

voidPutbinary (intN) {    intBITS =sizeof(N) *8;  while(bits-->0) {printf ("%d", n>>bits&1); if(bits%4==0) printf (" "); } printf ("\ n");}

2. Negative numbers in-memory storage

1 int Main () 2 {3     int B =-ten;   4     return 0 ; 5  

In line 3rd, an integer variable is defined, and its value is-10. How is 10 stored in memory? In fact, any value is stored in the form of complement in memory.

• The complement of positive numbers is the same as the original code. Like 9, the original code and the complement are 1001.
• The complement of a negative number equals its positive number and the original code is reversed after +1. (The inverse means 0 change 1, 1 to 0)

Then-the 10 complement calculation process is as follows:

1> first calculates the binary form of 10:0000 0000 0000 0000 0000 0000 0000 1010

2> Reverse 10 binary: 1111 1111 1111 1111 1111 1111 1111 0101

3> results of reverse +1:1111 1111 1111 1111 1111 1111 1111 0110

Therefore, the integer-10 binary form in memory is: 1111 1111 1111 1111 1111 1111 1111 0110

3. Range of values

Memory analysis of "Learning notes" and "C language" variables