about typedef in the C language

To define a struct in the C language, it is best to use TypeDef, and the typedef is actually a new name for our struct that defines a new type, and when you write your own code, you can directly use the new type first variable that you define.

For example

#include <stdio.h>typedef struct{    int num;    struct Node *next;} Node;int Main () {    Node n;    n.num=111;    printf ("%d", n.num);    return 0;}

By using TypeDef, we define the struct as the new struct type--node, and when used later, you can define the variable directly using Node.

　　

#include <stdio.h>struct node{    int num;    struct Node *next;}; int main () {    struct Node n;    n.num=111;    printf ("%d", n.num);    return 0;}

However, when we declare a variable later in the absence of a TypeDef, we must indicate that node is a struct, otherwise the compiler does not know the existence of a node type variable.

In short, in C language, typedef is a struct XX from an alias, convenient to write later.

　　

But in C + +, there is no such requirement.

　　

#include <iostream>using namespace std;struct node{    int num;    Node *next;}; int main () {    Node n;    n.num=111;    cout<<n.num;    return 0;}

Visible, in C + +, once the struct is declared as a new type, it can be used directly later.

about typedef in the C language