struct contains a struct-body pointer

Header file:

#include <stdio.h>#include<stdlib.h><string.h>

Global variables:

Const intT_length =2;intS_index = the; typedefstructstudent{intID; Charname[ -]; intAge ;} Student;typedefstructteacher{intID; Charname[ -]; intAge ; intS_num; Student*Stu;} Teacher;

Function Prototypes:

 void  createteahcer (Teacher **ppt,int  t_num); //  void  freeteacher (Teacher *pt, int  t_num); //  free memory  void  sortstudent (Student * pt, int  num); //  Sort the student array  void  sortteacher (Teacher *pt, int  num); //  sort of the teacher array  void  printteacher (Teacher *pt, int  num); //  Iterate through the array  

Implementation method:

voidCreateteahcer (Teacher **ppt,intt_num) {Teacher*temp; Temp= (Teacher *)malloc(sizeof(Teacher) *t_num); *ppt =temp;}voidFreeteacher (Teacher *pt,intt_num) {        inti; if(pt! =NULL) {         for(i =0; i < T_num; ++i) {            if(Pt[i].stu! =NULL) {                 Free(Pt[i].stu); Pt[i].stu=NULL; }        }         Free(PT); }    }voidSortstudent (Student * PT,intnum) {        intI, J;    Student temp;  for(i =0; i < num; ++i) {         for(j = i +1; J < num; ++j) {            if(Pt[j].age <pt[i].age) {Temp=Pt[j]; PT[J]=Pt[i]; Pt[i]=temp; }        }    }}voidSortteacher (Teacher *pt,intnum) {    intI, J;    Teacher temp;  for(i =0; i < num; ++i) {         for(j = i +1; J < num; ++j) {                    if(Pt[j].age <pt[i].age) {Temp=Pt[j]; PT[J]=Pt[i]; Pt[i]=temp;    }} sortstudent (Pt[i].stu, pt[i].s_num); }}voidPrintteacher (Teacher *pt,intnum) {    intI, j =0;    Student Stu; printf ("\ n");  for(i =0; i < num; ++i) {printf ("Study Number:%d Name:%s Age:%d\n", Pt[i].id, Pt[i].name, pt[i].age);  for(j =0; J < Pt[i].s_num; ++j) {Stu=(Pt[i].stu) [j]; printf ("%d students number:%d Name:%s Age:%d\n", J +1, Stu.id, Stu.name, stu.age); }    }}

Test:

intMain () {intI, J; Teacher*PT =NULL; Createteahcer (&pt, T_length);  for(i =0; i < t_length; ++i) {Pt[i].id= i +1002; printf ("Please enter the name of the teacher in section%d:", i +1); scanf ("%s",&(Pt[i].name)); printf ("Please enter the age of the teacher in page%d:", i +1); scanf ("%d", &(Pt[i].age)); printf ("Please enter the number of students who are taking the class%d teachers:", i +1); scanf ("%d", &(Pt[i].s_num)); Pt[i].stu= (Student *)malloc(sizeof(Student) *(Pt[i].s_num)); Allocate memory for students owned by teachers for(j =0; J < Pt[i].s_num; ++j) {(pt[i].stu) [J].id= the+ s_index++; printf ("Please enter the name of the first class%d students:", J +1); scanf ("%s",&((pt[i].stu) [j].name)]; printf ("Please enter the age of%d students:", J +1); scanf ("%d", &((pt[i].stu) [j].age)];    }} sortteacher (Pt,t_length);    Printteacher (PT, t_length);    Freeteacher (PT, t_length); System ("Pause"); return 0;}

Operation Result:

struct contains a struct-body pointer