A student information management program written in C ++

# Include <iostream>

# Include <fstream>

# Include <string>

Using namespace STD;

Struct student

{

String SnO;

String sname;

String ssex;

String sclass;

Student * next;

 

};

Class linklist

{

Public:

Student * head;

Student * last;

 

 

Linklist ()

{

Head = NULL;

Last = NULL;

}

Void creat ();

Void insert ();

Void del ();

Void show ();

Void Lookup ();

Void Update ();

Void save ();

};

Void linklist: creat ()

{

Head = new student;

Last = new student;

Last-> next = NULL;

Last-> SnO = "ABCDE ";

Head-> SnO = "0 ";

Head-> next = last;

 

Ifstream infile ("Stu. dat", IOS: In );

If (! Infile) void;

Else

{

While (! Infile. EOF ())

{

Student * P1;

P1 = new student;

P1-> next = NULL;

Infile> P1-> SnO;

Infile> P1-> sname;

Infile> P1-> ssex;

Infile> P1-> sclass;

Student * P;

P = head;

While (P1-> SnO> P-> next-> SnO)

{

P = p-> next;

}

P1-> next = p-> next;

P-> next = p1;

 

}

Infile. Close ();

 

 

}

}

Void linklist: insert ()

{

// Ofstream OUTFILE ("Stu. dat ");

// If (! OUTFILE)

//{

// Cerr <"Open Error !! "<Endl;

// Exit (1 );

//}

Student * stu1;

Stu1 = new student;

Stu1-> next = NULL;

Cout <"Enter the student ID:" <Endl;

Cin> stu1-> SnO;

// OUTFILE <stu1-> SnO <Endl;

Cout <"Enter the student's name:" <Endl;

Cin> stu1-> sname;

// OUTFILE <stu1-> sname <Endl;

Cout <"Enter the student's Gender:" <Endl;

Cin> stu1-> ssex;

// OUTFILE <stu1-> ssex <Endl;

Cout <"Enter the student's class:" <Endl;

Cin> stu1-> sclass;

// OUTFILE <stu1-> sclass <Endl;

Student * P;

P = head;

While (stu1-> SnO> P-> next-> SnO)

{

P = p-> next;

}

Stu1-> next = p-> next;

P-> next = stu1;

 

 

// OUTFILE. Close ();

}

Void linklist: Lookup ()

{

Student * P;

P = head;

String P1;

Cout <"Enter 1 for search by student ID" <Endl;

Cout <"enter 2 for search by name" <Endl;

Cout <"Enter 3 for searching by class" <Endl;

Cout <"to cancel the operation, enter 4" <Endl;

 

Int;

Cin>;

If (A = 1)

{

Cout <"Enter the student ID:" <Endl;

Cin> P1;

While (p-> SnO! = "ABCDE ")

{

If (p1 = p-> SnO) break;

Else P = p-> next;

}

If (p-> SnO = "ABCDE ")

Cout <"no student !! "<Endl;

Else cout <p-> SnO <"" <p-> sname <"<p-> ssex <" <p-> sclass <endl;

}

If (A = 2)

{

Cout <"Enter name:" <Endl;

Cin> P1;

Int COUNT = 0;

While (p-> SnO! = "ABCDE ")

{

If (p-> sname = p1)

{

Cout <p-> SnO <"" <p-> sname <"<p-> ssex <" <p-> sclass <Endl;

Count ++;

 

}

P = p-> next;

}

If (COUNT = 0) cout <"No such person" <Endl;

}

If (A = 3)

{

Cout <"Enter the class:" <Endl;

Cin> P1;

Int COUNT = 0;

While (p-> SnO! = "ABCDE ")

{

If (p-> sclass = p1)

{

Cout <p-> SnO <"" <p-> sname <"<p-> ssex <" <p-> sclass <Endl;

Count ++;

 

}

P = p-> next;

}

If (COUNT = 0) cout <"No such person" <Endl;

}

}

Void linklist: del ()

{

String P1;

Cout <"Enter the student ID you want to delete :";

Cin> P1;

Student * P;

P = head;

While (p-> next! = NULL)

{

P = p-> next;

If (p-> next-> SnO = p1)

{

Int A = 0;

Cout <p-> next-> SnO <"" <p-> next-> sname <"<p-> next-> ssex <"" <p-> next-> sclass <Endl;

Cout <"Do you really want to delete this student? Enter the number 1 for confirmation and 0 for cancellation. <Endl;

Cin>;

If (A = 1)

{

Student * q;

Q = p-> next;

P-> next = p-> next;

Delete Q;

Break;

}

If (A = 0) break;

}

If (p-> next = NULL & P-> SnO! = P1)

Cout <"no student !! "<Endl;

}

}

Void linklist: Update ()

{

Int COUNT = 0;

String P1;

Student * P;

P = head;

Cout <"Enter the student ID you want to modify:" <Endl;

Cin> P1;

While (p-> next! = NULL)

{

If (p-> SnO = p1)

{

Count ++;

Int;

Cout <p-> SnO <"" <p-> sname <"<p-> ssex <" <p-> sclass <Endl;

Cout <"Enter 1 to modify the student ID" <Endl;

Cout <"enter 2 for name modification" <Endl;

Cout <"change gender to 3" <Endl;

Cout <"Enter 4 for modifying the class" <Endl;

Cout <"to cancel the operation, enter 0" <Endl;

Cin>;

If (A = 1)

{

String B;

Cout <"enter a new student ID :";

Cin> B;

P-> SnO = B;

}

Else if (a = 2)

{

String B;

Cout <"enter a new name :";

Cin> B;

P-> sname = B;

}

Else if (a = 3)

{

String B;

Cout <"enter a new gender :";

Cin> B;

P-> ssex = B;

}

Else if (a = 4)

{

String B;

Cout <"enter a new class :";

Cin> B;

P-> sclass = B;

}

 

Else cout <"input error !! "<Endl;

Break;

}

P = p-> next;

}

If (COUNT = 0) cout <"NONE" <Endl;

}

Void linklist: Show ()

{

Student * P;

P = head;

Int COUNT = 0;

 

While (p-> next! = Last)

{

Cout <p-> next-> SnO <"" <p-> next-> sname <"<p-> next-> ssex <"" <p-> next-> sclass <Endl;

P = p-> next;

Count ++;

 

}

If (COUNT = 1) cout <"no data" <Endl;

}

Void linklist: Save ()

{

Cout <"storing data ............ "<Endl;

Cout <"do not close the window" <Endl;

Student * P;

P = head;

Ofstream OUTFILE ("Stu. dat", IOS: Out );

If (! OUTFILE)

{

Cerr <"failed to open the file. The file cannot be stored !! "<Endl;

Exit (1 );

}

While (p-> next! = Last)

{

OUTFILE <p-> next-> SnO <"";

OUTFILE <p-> next-> sname <"";

OUTFILE <p-> next-> ssex <"";

OUTFILE <p-> next-> sclass <"";

P = p-> next;

 

}

OUTFILE. Close ();

}

 

Int main ()

{

 

Linklist L;

L. creat ();

Int T1 = 0;

While (T1 = 0)

{

Int T2;

Cout <"Enter 1 for new student information;" <Endl;

Cout <"enter 2 for modifying student information;" <Endl;

Cout <"Enter 3 for student information search;" <Endl;

Cout <"Enter 4 for deleting student information;" <Endl;

Cout <"enter 5 for viewing all student information;" <Endl;

Enter 6 for cout <"exit;" <Endl;

Cin> T2;

If (t2 = 1)

{

While (t2 = 1)

{

L. insert ();

Enter 0 for the cout <"back to the main menu;" <Endl;

Enter 1 for cout <"continue operation;" <Endl;

Cin> T2;

If (t2 = 0) T1 = 0;

}

}

Else if (t2 = 2)

{

While (t2 = 2)

{

L. Update ();

Enter 0 for the cout <"back to the main menu;" <Endl;

Enter 1 for cout <"continue operation;" <Endl;

Cin> T2;

If (t2 = 0) T1 = 0;

}

}

Else if (t2 = 3)

{

While (t2 = 3)

{

 

L. Lookup ();

Enter 0 for the cout <"back to the main menu;" <Endl;

Enter 1 for cout <"continue operation;" <Endl;

Cin> T2;

}

}

Else if (t2 = 4)

{

While (t2 = 4)

{

 

L. Del ();

Enter 0 for the cout <"back to the main menu;" <Endl;

Cout <"Exit, enter 1;" <Endl;

Cin> T2;

If (t2 = 0) T1 = 0;

 

}

}

Else if (t2 = 5)

{

While (t2 = 5)

{

 

L. Show ();

Enter 0 for the cout <"back to the main menu;" <Endl;

Enter 1 for cout <"continue operation;" <Endl;

Cin> T2;

If (t2 = 0) T1 = 0;

}

}

Else if (t2 = 6)

{

Break;

}

Else

Cout <"input error !! "<Endl;

 

 

 

}

L. Save ();

Cout <"Storage completed" <Endl;

Return 0;

 

}