Student database
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c_cpp
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// 21132_Shreyash Halge
// Code for OOPCG Lab / Assignment 2 / Version 2
// comments, display all, copy constructor
#include <bits/stdc++.h> //Using standard library instead of including many libraries
#include <limits> //For exception handling
#include <ctime> //For getting current time and date
using namespace std;
// exception handling for roll number
int inputRollno(string s) //string s is used as different output is required in different cases
{
while (true)
{
cout<<"\nEnter the roll number "+s;
//try and catch is used for exception handling. the statements expected to give errors are written in try block
try
{
string temp;
cin >> temp;
// checking if roll number is a digit
for (char i : temp)
{
if (!isdigit(i))
{
throw "Roll number must be a digit\n";
break;
}
}
stringstream obj(temp);
int strnum;
obj>>strnum;
cout<<endl;
return strnum;
break;
}
// message thrown by throw is catched here
catch (const char *msg)
{
cout << msg;
}
}
}
//print list of roll numbers of student in database
void printRNList(vector<int>v, int n)
{
cout<<"List of students already present in database: [";
for(int rn=0; rn<n; rn++)
{
if(v[rn] != 0){cout<<v[rn]<<", ";} //If the value of roll number is other than 0(which is default value), print the roll number
}
cout<<"]"<<endl;
}
// this function is used to get empty spot(where there is no student) in the vector, studentObject array and personalInfoObject array
int searchEmptySpot(vector<int> v, int n)
{
for(int i=0; i<n; i++){
if(v[i]==0){return i;}
}
return -1; //it returns -1 if there is no empty spot
}
// this function gives the index of the roll no passed as argument
int getIndex(vector<int> v, int K)
{
//using built in function for finding position
auto it = find(v.begin(), v.end(), K);
// If element was found
if (it != v.end())
{
// calculating the index of K
int index = it - v.begin();
return index;
}
else {
// If the element is not present in the vector
return -1;
}
}
// class personalInfo
class personalInfo
{
// private members of class personalInfo
private:
string address;
string dob;
string bloodGroup;
string licence;
public:
// public members of class personal info
personalInfo();
personalInfo(personalInfo &);
~personalInfo();
// Student is made friend class of class personalInfo, so that student can use private members of this class
friend class Student;
};
// default constructor of class personalInfo is defined here
personalInfo::personalInfo()
{
address="abc, xyz";
dob="00/00/0000";
bloodGroup="X+";
licence="ABC00000";
}
// copy constructor of class personalInfo is defined here
personalInfo::personalInfo(personalInfo &obj)
{
//this is a pointer points to the object which invokes it
this->address=obj.address;
this->dob=obj.dob;
this->bloodGroup=obj.bloodGroup;
this->licence=obj.licence;
}
// destructor of class personalInfo is defined
personalInfo::~personalInfo()
{
cout<<"Successfully deleted personal information of a student"<<endl;
}
// class student
class Student
{
//private members of class student
private:
string name;
int rollno;
string year;
string division;
string mobile;
public:
// public members of class student
Student();
Student(Student&);
~Student();
// static class variable and static class functions are declared and defined
static int count;
inline static void incrementCount(){Student::count++;}; //to increment count
inline static void decrementCount(){Student::count--;}; //to decrement count
inline static void showCount(){cout<<"Total number of students: "<<Student::count;} //to show count
//create method is used to create a student in database
void create(personalInfo &obj, int rolno)
{
cout<<"---------------------------------"<<endl;
rollno=rolno;
cout<<"Enter the details of the new student:";
cout<<"\nNAME : ";
cin.ignore();
getline(cin, name); //inline function is used to get full name
cout<<"YEAR : ";
cin>>year;
cout<<"DIVISION: ";
cin>>division;
// exception handling for mobile number
while (true)
{
cout<<"PHONE NUMBER: ";
// try throw catch is used
try
{
string temp;
cin >> temp;
// telephone number should be 10 digits long
if (temp.length() != 10)
{
throw "Telephone number must be 10 characters long\n";
}
// it should be numeric
for (char i : temp)
{
if (!isdigit(i))
{
throw "Telephone no must be a digit\n";
break;
}
}
mobile = temp;
break;
}
catch (const char *msg)
{
cout << msg;
}
}
cout<<"ADDRESS : ";
cin.ignore();
getline(cin, obj.address); //getline is used to get complete address
// Code to find today's date
time_t ttime = time(nullptr);
tm *local_time = localtime(&ttime);
int year = 1900 + local_time->tm_year;
int month = 1 + local_time->tm_mon;
int day = local_time->tm_mday;
string todayDate = to_string(day) + '/' + to_string(month) + '/' + to_string(year);
// exception handling for date of birth
while (true)
{
// try throw catch is used for error handling
try
{
cout << "DATE OF BIRTH: (dd/mm/yyyy): ";
string temp;
cin >> temp;
int dayInt;
int monthInt;
int yearInt;
stringstream dayStream, monthStream, yearStream; // used to convert string into an int
dayStream << temp.substr(0, 2);
dayStream >> dayInt;
monthStream << temp.substr(3, 2);
monthStream >> monthInt;
yearStream << temp.substr(6, 4);
yearStream >> yearInt;
// throw statements in various situations
if (temp[2] != '/' || temp[5] != '/')
{
throw "Invalid birth date format";
}
else if (yearInt > year)
{
throw "The date you entered has not came yet. ;p";
}
else if (yearInt == year && monthInt > month)
{
throw "The date you entered has not came yet. ;p";
}
else if (monthInt == month && dayInt > day && yearInt == year)
{
throw "The date you entered has not came yet. ;p";
}
obj.dob = temp;
break;
}
catch (const char *msg)
{
cout << msg << endl;
}
}
// exception handling for blood group
while (true)
{
cout<<"BLOOD GROUP: ";
try
{
string temp;
cin >> temp;
// it only accepts these blood groups
if (temp=="A+" || temp=="B+" || temp=="O+" || temp=="A-" || temp=="B-" || temp=="O-" || temp=="AB+" || temp=="AB-")
{
obj.bloodGroup = temp;
break;
}
else
{
throw "Enter a valid blood group. e.g. A+ or AB-\n";
}
break;
}
catch (const char *msg)
{
cout << msg;
}
}
cout<<"LICENCE NUMBER : ";
cin>>obj.licence;
cout<<"---------------------------------"<<endl;
incrementCount();
}
// display method is used to display the student with given roll number
void display(personalInfo &obj)
{
cout<<"---------------------------------"<<endl;
cout<<"NAME OF STUDENT : "<<name<<endl;
cout<<"ROLL NO : "<<rollno<<endl;
cout<<"YEAR : "<<year<<endl;
cout<<"DIVISION : "<<division<<endl;
cout<<"PHONE NUMBER : "<<mobile<<endl;
cout<<"ADDRESS OF STUDENT : "<<obj.address<<endl;
cout<<"DATE OF BIRTH : "<<obj.dob<<endl;
cout<<"BLOOD GROUP : "<<obj.bloodGroup<<endl;
cout<<"LICENCE NUMBER : "<<obj.licence<<endl;
cout<<"---------------------------------"<<endl;
}
// update method is used to update the data of student already present in database
void update(personalInfo &obj, int rolno)
{
create(obj, rolno); //code of create function is reused
cout<<"Student data updated successfully."<<endl;
}
// delete method is used to delete a student from the database
void deleteStudent(personalInfo &obj)
{
obj.~personalInfo(); // student is friend class of personalInfo, therefore we can call destructor for personalInfo using the object of student class
this->~Student();
}
};
// when we write this, the memory is allocated to stati variable count and is set to 0 for default
int Student::count;
// default constructor of class student
Student::Student()
{
name="Name";
rollno=0;
year="0";
division="SE0";
mobile="0000000000";
}
// copy constructor of class student
Student::Student(Student &obj)
{
cout<<"here"<<endl;
// this is a pointer points to the object which invokes it
this->name=obj.name;
this->year=obj.year;
this->division=obj.division;
this->rollno=obj.rollno;
this->mobile=obj.mobile;
}
// destructor of class student
Student::~Student()
{
cout<<"Succesfully deleted student."<<endl;
}
// driver code
int main()
{
//Welcome message for the user
cout<<"Welcome to the student database portal!\nNow you can easily store and manage data of all your students.\n";
// taking input for maximum number of students in database
cout<<"Enter the maximum number of students in your database: ";
int n;
cin>>n;
// new is dynamic memory allocation operator, studentObject is pointer of type student and it is a array of object of size n
Student *studentObject=new Student[n];
// new is dynamic memory allocation operator, personalInfoObject is pointer of type student and it is a array of object of size n
personalInfo *personalInfoObject=new personalInfo[n];
// vector rollNoList stores the roll numbers of students in the database
vector <int> rollNoList(n);
// while loop is used to perform operations till the user enters 'n'
while(true)
{
// information of program
cout<<"This program allows you to:\n1. Create a student\n2. Read the data previously stored.\n3. Show all students in database.\n4. Update data of existing student.\n5. Delete an existing student.\n6. Copy constructor.\n";
cout<<"\nEnter the choice for respective operation which you want to perform(1 to 6): ";
//error handling for choice
string temp;
cin>>temp;
stringstream obj(temp); //used to convert string to int
int choice;
obj>>choice;
//choice for creating student
if(choice==1)
{
// Printing the list of students already present in database
printRNList(rollNoList, n);
// Taking roll number of student as input
int rollno = inputRollno("of the student you want to add: ");
// When getIndex returns -1, it means that the roll number is not present. So when getIndex!=-1, it means that roll number is already present in list
if(getIndex(rollNoList, rollno) !=-1)
{
cout<<"This roll number is already present. Try other roll number of update the student."<<endl;
}
else
{
// Search empty spot returns the index in array such that there is no student on that index. It returns -1 if there is no empty spot
int i = searchEmptySpot(rollNoList, n);
if(i==-1){cout<<"Database is Full."<<endl;}
else{
rollNoList[i]=rollno;
studentObject[i].create(personalInfoObject[i], rollno);
Student::incrementCount(); //inline static function is used to increment count of number of students in database
}
}
}
// choice for displaying student with given roll numbrer
else if(choice==2)
{
// Printing the list of students already present in database
printRNList(rollNoList, n);
// Taking roll number of student as input
int rollno = inputRollno("of the student you want to dispay: ");
// When getIndex returns -1, it means that the roll number is not present. So when getIndex!=-1, it means that roll number is already present in list
int i=getIndex(rollNoList, rollno);
if(i==-1)
{
cout<<"Student with the given roll number do not exist in database. Enter another roll number or add a new student with given roll number."<<endl;
}
else
{
studentObject[i].display(personalInfoObject[i]);
}
}
// choice to show all students in database
else if(choice==3)
{
for(int i=0; i<n; i++)
{
//if the roll number of student is not zero then data of that student is printed
if(rollNoList[i]!=0)
{
studentObject[i].display(personalInfoObject[i]);
}
}
}
// choice for updating the student information
else if(choice==4)
{
// Printing the list of students already present in database
printRNList(rollNoList, n);
// Taking roll number of student as input
int rollno= inputRollno("of student you want to update: ");
// When getIndex returns -1, it means that the roll number is not present. So when getIndex!=-1, it means that roll number is already present in list
int i=getIndex(rollNoList, rollno);
if(i ==-1)
// if roll number is not present in the list
{
cout<<"Student with the given roll number do not exist in database. Enter another roll number or add a new student with given roll number."<<endl;
}
else
{
// display the previous details
cout<<"Here are the details you entered previously for this roll number:"<<endl;
studentObject[i].display(personalInfoObject[i]);
// input new roll number to be given
int rollNo=inputRollno("you want to give to the student: ");
// updating student
studentObject[i].update(personalInfoObject[i], rollNo);
rollNoList[i]=rollNo;
}
}
// choice for deleting the student
else if(choice==5)
{
// Printing the list of students already present in database
printRNList(rollNoList, n);
// Taking roll number of student as input
int rollno= inputRollno("of student you want to delete: ");
// When getIndex returns -1, it means that the roll number is not present. So when getIndex!=-1, it means that roll number is already present in list
int i=getIndex(rollNoList, rollno);
if(i ==-1)
// if student is not present in database
{
cout<<"Student with the given roll number do not exist in database. Enter another roll number or add a new student with given roll number."<<endl;
}
else
{
studentObject[i].deleteStudent(personalInfoObject[i]);
rollNoList[i]=0;
Student::decrementCount(); //inline static function is used
}
}
// choice for copying a student
else if(choice==6) // Copy Constructor
{
// Student obj1;
// personalInfo obj2;
printRNList(rollNoList, n);
int rn=inputRollno("of student you want to copy: ");
int i= getIndex(rollNoList, rn);
int empty=searchEmptySpot(rollNoList, n);
cout<<empty<<endl;
if(i==-1)
// if student is not present in database
{
cout<<"Roll number you entered is not present in the database."<<endl;
}
else{
int roln= inputRollno("you want to give to the copied student: ");
// studentObject[i].copy(personalInfoObject[i]);
Student studentObject[empty](studentObject[i]); //invoking copy constructor of student info to copy contents from object i to 1
personalInfo personalInfoObject[empty](personalInfoObject[i]); //invoking copy constructor of personal info to copy contents from object i to 2
rollNoList[empty]=roln;
cout<<"\nCopy Constructor is called. The student is copied.\n";
// studentObject[empty].display(personalInfoObject[empty]);
}
}
// exception handling for choice
else
{
cout<<"The choice you entered is invalid. Enter a choice 1 to 6."<<endl;
}
cout<<"\n---------------------------------";
cout<<"\nDo you want to continue?(y/n): ";
string contin;
cin>>contin;
cout<<"---------------------------------\n";
if(contin=="n" || contin=="N")
{
// delete is used to delete arrays personalInfoObject and studentObject
delete [] studentObject;
delete [] personalInfoObject;
break;
}
else{continue;}
}
cout<<"\nThank You for using the program.\n";
return 0;
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