Summary, I feel that I can help beginners see some complicated grammar rules, understand the true meaning of C language.
The first release, not necessarily correct, welcome to discuss, correct, supplement
Patient
Any operation that generates numerical results can be used as an expression, and can be placed in any way that requires numerical results, as long as the numerical type can match
Common, calculations and operations that can generate numerical results
Arithmetic, logic, bit operation, etc.
?:
&, *, Etc.
Return value function
Common places where you need a value:
Value
Condition judgment
Function call
2. Type law
Any type can be used in any type of place
Known special case
Function return value cannot be defined as an array type
Common type
Basic data type, pointer, array, structure ...
Common needs type
Define variables
Define pointers, arrays, and structures
Function parameters and return values
Sizeof
3. Parameter delivery law
The parameter passes when the function call is always called, and the value of the value is copied.
Introduction: the parameters provided by the caller
Conversion: Function Defined Parameters
Basic data types are not suspicious
Struct is also free
When the pointer is used as a parameter, the content of the pointer variable (that is, the memory address it pointing) is copied.
When the array name is used as a parameter, it is equivalent to the pointer.
