It is said that starred candidates have all succeeded in their exams.
Follow the guidance to avoid getting lost. Please recommend this to more graduate students.
Many students preparing for the 26th exam do not know how to review for 408, feeling completely lost.
They start by reviewing data structures, leading to confusion as many key concepts are hard to understand.
Here, Wangzai has listed some essential C language knowledge that must be mastered before starting the 408 review!
This will help everyone study more effectively~
01
Data Types and Data Storage
Programs and data are stored in memory in binary form.
Data Storage: Memory allocates several storage units to store data in binary form, returning the address of the first unit as the address of that data. Every data storage includes address and type information.
Example: Storing the positive integer 345 in units 4, 5, 6, and 7, with the type being integer, thus occupying 4 bytes. The address is 4, and to retrieve this data, the address 4 must be provided, along with its type, to retrieve the 4 consecutive bytes.
02
Variables
A variable represents a named storage unit with specific attributes used to store data, meaning the variable’s value can change during program execution.
A variable must be declared before use, specifying the name and type when defined, and can also specify an initial value.
Specific attribute: integer, occupying 4B
C language specifies that variable names can only consist of letters, digits, and underscores, are case-sensitive, and the first character must be a letter or underscore, not a digit.
Valid variable names: sum, total, lotus 1 2, Class
Invalid variable names: M.D.John, 3D64, ￥123
3. Common Data Types
Boolean (bool) Type: Represents a data type that indicates true and false.
C language did not have a bool type before the C99 standard, using 0, NULL to represent false, and non-0, non-NULL to represent true. C++ has a bool type, where true represents true and false represents false.
Struct: A data type consisting of a group of different data called members, which can be defined according to one’s needs, with each member potentially having a different type.
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