the purpose of that lines 12 and 13

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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hi what is the purpose of that lines 12 and 13 

// Fig. 12.13: fig12_13.c
2 // Operating and maintaining a queue
#include <stdio.h>
3
4 #include <stdlib.h>
5
6 // self-referential structure
7 struct queueNode {
char data; // define data as a char
struct queueNode *nextPtr; // queueNode pointer
8
10 };
II
12
typedef struct queueNode QueueNode;
13
typedef QueueNode *QueueNodePtr;
Transcribed Image Text:// Fig. 12.13: fig12_13.c 2 // Operating and maintaining a queue #include <stdio.h> 3 4 #include <stdlib.h> 5 6 // self-referential structure 7 struct queueNode { char data; // define data as a char struct queueNode *nextPtr; // queueNode pointer 8 10 }; II 12 typedef struct queueNode QueueNode; 13 typedef QueueNode *QueueNodePtr;
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