# define TypeDef const FOR C + + keywords

"#define"

#define是预处理指令, a simple substitution is made during the pre-processing of the compilation without checking for correctness.

"typedef"

A typedef is simply a new name for the identifier to be added for readability

Give an alias to an already existing type within its own scope.

C + + Code

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typedef int *int_ptr; #define INT_PTR int * INT_PTR A, B; //int *a,*b; int_ptr A, b; //int *a,b;

"Const"

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Const int*p;//*p is const int Const*p;//*p is const int *Constp;//P is const Const int *Constp; //*p and P are both const

Const on the left, the *p is a whole, immutable; The const is on the right, p is a whole, cannot be changed.

"#define-TYPEDEF-CONST"

C + + Code

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Const INT_PTR p;   //===>int* const p; (P is const) Const INT_PTR p;   //===>const int *p; (*p is const)

# define typedef const

for C + + keywords