struct Student {
Int studid./* */student id 
Char name [10]./* name */
Int math;/* */
 in mathInt English; English/* */
Int total;/* grade */
Struct Student * next; Pointer to the next node/* */
}; 
Struct Student * pstudHead;/* global pointer variable to head node */
Void main () {
Struct Student * p; Temporary structure pointer/* */
PstudHead=(struct Student *) malloc (sizeof (struct Student)); 
PstudHead - & gt; Next=NULL; 
While (1) 
{
P=(struct Student *) malloc (sizeof (struct Student)); 
The scanf (" % d ", & amp; (p - & gt; Studid)); 
If (p - & gt; Studid==1) 
{free (p); break; } 
The scanf (" % s ", & amp; (p - & gt; Name)); The scanf (" % d ", & amp; (p - & gt; Math)); 
The scanf (" % d ", & amp; (p - & gt; English)); P - & gt; Total=p - & gt; Math + p - & gt; English; 
P - & gt; Next=pstudHead - & gt; Next; PstudHead - & gt; Next=p; 
} 
P=pstudHead - & gt; Next; 
Printf (" student id \ t \ \ t t name English grades in math scores \ n "); 
While (s!=NULL) {
Printf (" % d \ t ", p - & gt; Studid); Printf (" % s \ t ", p - & gt; Name); 
Printf (" % d \ t ", p - & gt; Math); Printf (" % d \ t ", p - & gt; English); 
Printf (" % d \ n ", p - & gt; Total); P=p - & gt; Next; 
} 
} 

Textbook program, always don't understand here

CodePudding user response:

When the students entered the first p - & gt; Next=NULL, patudHead - & gt; Next=first pointer,
When students enter the second, p points to the first student, pointing towards the second student

So each loop is, before the new student to a student, the head of the list to add the latest student,