C Language Review

• function cannot be nested inside a function

• What's The difference between these two?

#define A  int[10] is a macro definition and is only replaced at compile time, without type checking;
typedef int a[10]; Just give the int type a name, and type check when Compiling.

typedef type alias; type aliases with this

Characters replaced by #define name macro definition just replace one of your writing with something else, such as # define Hello "hello" and replace Hello with "hello"

The definition of Functions in C language is parallel and independent of each other,
That is, in a function definition, the function body cannot contain the definition of another function, that is, the function cannot be nested , but can be nested .
Nesting functions means that in some cases you may need to use a function as an argument to another function, which is a nested function.

• Precedence of relational operators

C Language Review