#include  
#include  
# define N 108 

Typedef struct telephone 
{
Char name [25]; 
Char num [25]; 
Char tel [25]; 
} TEL; 

Void DisplayMenu ();//display the main menu 
Void the save (TEL a [], int n); 
Void CreateList (TEL a [], int n);//1. Create a directory 
Void DisplayList (TEL a [], int n);//2. According to the address book 
Void InquireListName (TEL a [], int n);////3. The name query address book 
Void InquireListNum (TEL a [], int n);//4. According to the student number query address book 
Void ChangeListName (TEL a [], int n);//5. According to the name change address book 
Void ChangeListNum (TEL a [], int n);//6. According to the student id to modify address book 
Int DelListName (TEL a [], int n);//7. According to the name delete the address book 
Int DelListNum (TEL a [], int n);//8. According to the student id to delete the address book 
Void UpSortListName (TEL a [], int n);//9. Name ascending order address book 
Void DownSortListNum (TEL a [], int n);//10. Student id reverse ordering address book 
Int AddList (TEL a [], int n);//11. Add student information 


Int main () 
{
Struct telephone a, [N]. 
Int I, n; 
The FILE * fp. 

If ((fp=fopen (" stu. Dat ", "r"))!=NULL)//if the file is stu. Dat existing 
{//the data from a file is loaded into the array (read the record number n and n name, student id, phone number) 
The fscanf (fp, "% d", & amp; n); 
for(i=0; iFscanf (fp, "% s % s % s", a  name, a [I] num, a [I]. Tel); 
} 
The else 
{
Printf (" first use of the system, please enter n and n name, student number, telephone number: \ n "); 
The scanf (" % d ", & amp; n); 
for(i=0; iThe scanf (" % s % s % s ", a [I]. Name, a [I] num, a [I]. Tel); 
Save (a, n); 
} 

DisplayMenu ();//display the main menu 
While (1) 
{
Char select; 
Char name [25]; 
The scanf (" % c ", & amp; Select); 

If (select<'a' | | select> 'l') 
{
Printf (" input error! \n"); 
continue; 
} 
//if (select=='l') 
//break; 

The switch (select) 
{
Case 'a' : 
DisplayMenu ();//display the main menu 
break; 
Case 'b' : 
DisplayList (a, n);//2. According to the address book 
break; 
Case 'c' : 
InquireListName (a, n);//3. The name query address book 
break; 
Case 'd' : 
InquireListNum (a, n);//4. According to the student number query address book 
break; 
Case 'e' : 
ChangeListName (a, n);//5. According to the name change address book 
break; 
Case 'f' : 
ChangeListNum (a, n);//6. According to the student id to modify address book 
break; 
Case 'g' : 
If (DelListName (a, n))//7. According to the name delete address book 
N -; 
break; 
Case 'h' : 
If (DelListNum (a, n))//8. According to the student id to delete address book 
N -; 
break; 
In case the 'I' : 
UpSortListName (a, n);//9. Name ascending order address book 
break; 
Case 'j' : 
DownSortListNum (a, n);//10. Student id reverse ordering address book 
break; 
Case 'k' : 
If (AddList (a, n))//11. Add student information 
N++; 
Save (a, n); 
break; 
Case 'l' : 
exit(0);//12. 
 exit systembreak; 
} 
} 
return 0; 
} 


Void the save (TEL a [], int n) 
{
int i; 
The FILE * fp. 
Fp=fopen (" stu. Dat ", "w"); 
Fprintf (fp, "% d \ n", n); 
for(i=0; iFprintf (fp, "% s \ n \ \ t t % s % s", a [I]. Name, a [I] num, a [I]. Tel); 
} 


Void DisplayMenu ()//1. According to the main menu 
{
Printf (" student address book management system \ n \ n "); 
Printf (" * * * * * * * * * * * * * * * * * * * * * * * * * system function menu * * * * * * * * * * * * * * * * * * * * * * * * * * \ n "); 
Printf (" -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- - \ n "); 
Printf (" b. a. according to the main menu display directory \ n "); 
Printf (" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * \ n "); 
Printf (" c. by name query directories d. according to the student number query directory \ n "); 
Printf (" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * \ n "); 
Printf (" f. e. according to the name change directories by student number change directory \ n "); 
Printf (" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * \ n "); 
Printf (" g. by name delete directories h. according to the student id to delete contacts \ n "); 
Printf (" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * \ n "); 
Printf (" i. name ascending sort directories j. student id reverse order directory \ n "); 
Printf (" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * \ n "); 
Printf (" k. add student information l. exit system \ n "); 
Printf (" -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- - \ n "); 
Printf (" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * \ n \ n "); 
Printf (" please choose you need operation: \ n "); 
} 


Void DisplayList (TEL a [], int n)//2. The show directory 
{
int i; 
Printf (" shows the address book: \ n "); 
for(i=0; iPrintf (" % s \ n \ \ t t % s % s ", a [I]. Name, a [I] num, a [I]. Tel); 
printf("\n"); 
} 


Void InquireListName (TEL a [], int n)//3. The name query address book 
{
Int I, flag; 
Char SearchName [25]; 
Printf (" by name query directories: \ n "); 
The scanf (" % s ", SearchName); 
For (I=0, flag=0; i{
If (STRCMP (SearchName, a [I] name)==0) 
{
Printf (" % s \ t, "a [I] name); 
Printf (" % s \ t, "a [I] num); 
Printf (" % s \ n ", a [I]. Tel); 
Flag=1; 
break; 
} 
} 
If (flag==0) 
{
Printf (" not query to the name information! \n"); 
} 
printf("\n"); 
} 


Void InquireListNum (TEL a [], int n)//4. According to the student number query address book 
{
Int I, flag; 
Char SearchID [25]; 
Printf (" according to the student number query directories: \ n "); 
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