A summary of the basic knowledge commonly used in the c language-often read often new

1. printf output;
2. Complement
3. The representation of signed and unsigned numbers  ---> To see how much a hexadecimal number is converted into a decimal number, first of all, it depends on whether the data type is signed or unsigned. //If the variable is a negative integer expressed in decimal, you must pay attention to the conversion of the complement.
4. Data type conversion order
5. Operator precedence
6. Data type over-limit analysis: article one , article two
7. Short byte conversion bit long byte complement sign bit
8. Constants and variables  ( or refer to this article )
9. The relationship between integer type and character type
10. The usage of switch (or refer to this article )
11. Pointers and arrays (or refer to this article ) (or refer to this article )
12. Dynamically initialize and destroy pointers
13. Constant pointers and pointer constants
14. String manipulation functions (or refer to this article )
15. File operation (or refer to the text ) (or the text ) (or the text ) (or the text ) (or the text ) (or the text ) (or the text )
16. Structure (or the text ) (or the text ) (or the text )
17. Union
18. Three program structures
19. Function pointer (or this article ) ( this article)
20. The function parameter is a pointer  ( or the text ) or the return value is a pointer (or the text ) (or the text )