The differences between typedef struct and struct in C + + __c++

typedef struct should be a C language design is not very reasonable place, the following explanation is still relatively clear.

Notice different in C and C + +
In C, you define a struct type with a typedef:
typedef struct STUDENT
{
int A;
}stu;

Stu stu1;

struct Student stu1;

So when you declare a variable, you can: Stu stu1;

( If there is no TypeDef, you must use struct Student stu1; to declare)

The Stu here is actually the alias of struct student. Stu==struct Student

////////////////////////////////////////////////////////////////////////////////////////////////////////////
In addition here also can not write Student (so also cannot struct Student stu1;, must be Stu stu1;)
typedef struct
{
int A;
}stu;

Stu stu1;

////////////////////////////////////////////////////////////////////////////////////////////////////////////

But in C + + is very simple, direct
struct Student
{
int A;
};

Student STU2;
Then the structure body type student is defined, and the STU2 is directly student when the variable is declared.

In C + +, if you use a TypeDef, it makes a difference:
struct Student
{
int A;
}STU1;//STU1 is a variable

stu1.a;

typedef struct STUDENT2
{
int A;
}STU2;//STU2 is a structural body type =struct Student

STU2 S2;

s2.a;

Direct access to stu1.a when used
But STU2 must first stu2 the S2;
Then s2.a=10;