when to use typedef in c code example

Example 1: typedef in c

typedef struct
{
  	//add different parts of the struct here
 	string username;
  	string password;
}
user; // name of struct - you can name this whatever

user example; //variable of type user

example.username = "Comfortable Caterpillar"; // username part of example variable
example.password = "password" // password part of example variable
  
if (user.username == "Comfortable Caterpillar")
{
	printf("upvote this if it helped!");
}

Example 2: C typedef

// Typedefs can also simplify definitions or declarations for structure pointer types. Consider this:

struct Node {
    int data;
    struct Node *nextptr;
};
// Using typedef, the above code can be rewritten like this:

typedef struct Node Node;

struct Node {
    int data;
    Node *nextptr;
};