Xiaolu Inn - Trailer

Introduce

Prospective senior students , At present, Shenzhen “ Man on man ”, A migrant worker who tries to explain what he understands with the most accessible examples . At present, it is tentatively scheduled to precipitate for half a year, that is to say, it will only be serialized for half a year , Mainly record and share their daily precipitation of knowledge , Currently includes C/C++、QT、 Embedded software GUI design idea . Someone may ask why it is half a year , Because the current internship time is half a year , Then if the middle is dismissed for various reasons, the serial may also be terminated ...

Purpose

On the one hand, it's easier to find a job with your own personal blog. After all, it's a bonus ; On the other hand, I am really precipitating something , There is real calmness to study something , Maybe it's nothing in the eyes of some technical bulls ... But I think the real learning is not self understanding , But you can make it clear to others , So with the current blog serialization .

A trial lecture

Now it's a c Linguistic *a and &a Explanation of a typical problem of , The following explanation style is the style in the subsequent serial blog . If the following style cannot be accepted, there is no need to read the following blog ...

about C Linguistic * and & Maybe a lot of people know *a It means a pointer ;&a Express a The address of ; Then you can start to run it at this time , The following code ：
int a=10;
int *b=&a;
printf("&d\n",&a);
printf("&d\n",*b)
After reading the output , If you know enough, you may not feel anything , But if you don't know enough, you may fall into doubt , Why are the results of the two different .
First of all, we need to understand the variable a The essence of , It is a storage unit , The storage unit itself is used as a container to store Something Also have their own identification , there Something It's called data , identification Called address . in other words a It can be either an address or a data , So how to determine the result of the visit when you visit ？ That's all C The rules of language , stay C Specified in the language a According to the data 、&a Address .
Then let's see * a, Here is the stored a Medium Stored address Corresponding Storage unit Of data , That is to say ： The current residence address of the wanted person I reported to the police is XX apartment 805 room , The place I report to the police here is equivalent to * a, I told the police the address , But is it the house of the address that the police want to catch ？ Not at all , It's the person in the address that needs to be caught .
Then we are looking at the code snippet above , * b=&a, What I got here is a The address of , The final output * b The output is a Content, not a The address of , It's like the police arresting people , It's people to catch, not the house represented by the address . So the final printf(“&d\n”,&a) Output is a a Address , and printf(“&d\n”,*b); The output is a The content of .

Last

If you feel that the above trial lecture is understood and interested, you also want , I hope you can use your hands to pay attention , Follow up blog can also pay more attention , thank .