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C++ Program Using Pointers

I want to express my sincere thanks to Anita Millspaugh and Dr. Swamy Narashammy for teaching me C++ language for three semesters.

This next page is only for programmers. It will not make sense if you are not into programming...sorry?

//Program: Adds, Removes, Single Display, All Display a list of

// students using pointers.

//Author: Esteban Cazarez.

//Profr. Swammy Narashammy.

//Date: 8/11/97 DEVRY INSTITUTE OF TECHNOLOGY.

//Semester: Spring 97'.

//NOTE: It can work in arrays too if you delete the remarks.

// You will have to fix the pointers to arrays.

#include <iostream.h> //Includes istream.h & frstream.h

#include <string.h> //For string functions

#include <conio.h> //Console I/O for cout, cin, getche()

#define FALSE 0

#define TRUE 1

enum command_type {ADD, DISPLAY, REMOVE, SHOWALL, QUIT, ILLEGAL};

command_type get_user_command()

{

char command[80];

cout << "Enter [A(dd),D(isplay),R(emove),S(howall),Q(uit)]:";

cin >> command;

switch(*command)

{case 'a':case 'A':return(ADD);

case 'd':case 'D':return(DISPLAY);

case 'r':case 'R':return(REMOVE);

case 's':case 'S':return(SHOWALL);

case 'q':case 'Q':return(QUIT);

default:return(ILLEGAL);}

}

int count=0; //Initialize count

class student

{

private:

int age;

char name[20];

char address[20];

char ssn[12];

public:

char* get_name(){return name;}

char* get_ssn(){return ssn;}

char* get_address(){return address;}

int get_age(){return age;}

//int get_count(){return count;} //Optional!

void add_student();

void remove_student(char ssn[]){}

//Not used in this example. Section reusable for Arrays.

//void change_name(char nam[]){strcpy(name,nam);}

//void change_ssn(char ss[]){strcpy(ssn,ss);}

//void change_address(char add[]){strcpy(address,add);}

//void change_age(int ag){age=ag;}

student(int age,char name[20], char address[20], char ssn[12]);

~student(){count --;} // Destructor

student *next; //Pointer

};

student *database;

student *temp;

//Construtor & body of the constructor below:

student::student(int ag,char nam[20], char add[30],char ss[12])

{

strcpy(name,nam);

strcpy(ssn,ss);

strcpy(address,add);

age=ag;

}

void add_student(int ag,char *nam, char *add, char *ss)

{

student *temp = new student(ag,nam,add,ss);

temp->next = database;

database=temp;

}

void remove_student(char *ss)

{

int found = FALSE;

student *temp, *previous;

temp=database, previous=NULL;

while(!found && temp != NULL)

if(strcmp(ss,temp->get_ssn())==0)

found=TRUE;

else

{previous = temp;

temp = temp->next;}

if(found)

{ if(previous==NULL)

database = database->next;

else

{previous->next = temp->next;

delete temp;}

}

else cout<<"Not found or deleted"<<endl;

}

void display_student(char *ss)

{

int found = FALSE;

student *temp, *previous;

temp = database, previous =NULL;

while(!found && temp != NULL)

if(strcmp(ss,temp->get_ssn())==0)

found = TRUE;

else

{previous = temp;

temp = temp->next;}

if(found)

{if(previous == NULL)

database=database->next;

else

{previous->next=temp->next;

cout<<"Name: "<<temp->get_name()<<endl;

cout<<"Address: "<<temp->get_address()<<endl;

cout<<"SSN: "<<temp->get_ssn()<<endl;

cout<<"Age: "<<temp->get_age()<<endl;

cout<<"Currently number of objects: "<<count<<endl;

delete temp;}

}

else

cout<<"Not in the database. Please try again!"<<endl;

}

void showall_student()

{

int found = FALSE;

student *temp;

student *previous;

temp = database;

previous = NULL;

while(temp != NULL)

{cout<<"Name: "<<temp->get_name()<<endl;

cout<<"Address: "<<temp->get_address()<<endl;

cout<<"SSN: "<<temp->get_ssn()<<endl;

cout<<"Age: "<<temp->get_age()<<endl;

cout<<"Total number of objects: "<<count<<endl;

temp = temp->next;}

}

main()

{

int ag,char nam[20],char add[20],char ss[12];

command_type com;

while((com = get_user_command())!=QUIT)

{

switch(com)

{

case ADD:

cout<<"Student's «AGE:» "<<endl;

cin>>ag;

cout<<"Student's «NAME:» "<<endl;

cin>>nam;

cout<<"Students «ADDRESS:» "<<endl;

cin>>add;

cout<<"Student's «SSN:» "<<endl;

cin>>ss;

add_student(ag,nam,add,ss);

break;

case DISPLAY:

cout<<"Enter the ssn to display:\n";

cin>>ss;

display_student(ss);

break;

case REMOVE:

cout<<"Enter the ssn# to remove:\n";

cin>>ss;

remove_student(ss);

break;

case SHOWALL:

showall_student();

break;

case ILLEGAL:

cout << "** Illegal Command. Program Terminated! **"

<< endl;}

}

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