Based on this program modify the source code so that it will able to save the student record into a database txt and able to display and modify from a database txt as well. you will also need to able...
Based on this program modify the source code so that it will able to save the student record into a database txt and able to display and modify from a database txt as well.
you will also need to able to modify the code so it will accept name such as "john kenny " and the progrom should also ask for the student id number.
#include<iostream>
#include<stdlib.h>
using namespace std;
struct st
{
int roll;
char name[50];
char grade;
struct st *next;
};
struct st *hptr=0; // declare null header of linked list
int addStudent();
int delete_student();
void display();
int update();
int search();
int main()
{
char ch;
int opt;
do
{
cout<<"Choose option:\n\t1. Add Student\n"
"\t2. Remove Student\n"
"\t3. Update grade\n"
"\t4. Search Student\n"
"\t5. Display Records\n";
cin>>opt;
switch(opt)
{
case 1: addStudent();
break;
case 2: delete_student();
break;
case 3: update();
break;
case 4: search();
break;
case 5: display();
break;
default:
cout<<"Invaild Option, Try again...!\n";
break;
}
cout<<"Do you wants another operation(y/n)? : ";
cin>>ch;
}while(ch=='Y'||ch=='y');
}
/* Add Student */
int addStudent()
{
st *temp = new st;
st *temp1 = new st;
cout<<"Enter roll no:";
cin>>temp->roll;
if(cin.fail()){
cout<<"Not numeric\n";
return 0;
}
cout<<"Enter name:";
cin>>temp->name;
cout<<"Enter grade:";
cin>>temp->grade;
// Head of linked list is null
if(hptr==0)
{
temp->next=hptr;
hptr=temp;
}
else
{
temp1=hptr;
while(temp1->next)
temp1=temp1->next;
temp->next=temp1->next;//NULL
temp1->next=temp;
}
}
/* Delete Student */
int delete_student()
{
int rollno;
st *temp = new st;
st *temp1 = new st;
cout<<"Do U wants to delete record ,then enter Roll No.:";
cin>>rollno;
//Rollno is not numeric
if(cin.fail()){
cout<<"Not numeric\n";
return 0;
}
temp=hptr;
while(temp)
{
if(temp->roll==rollno)
{
// searching record is head
if(temp==hptr)
{
hptr=temp->next;
free(temp);
return 0;
}
else
{
temp1->next=temp->next;
free(temp);
return 0;
}
}
temp1=temp;
temp=temp->next;
}
cout<<"Record is not found..!\n";
}
/* Update the grade of the student */
int update()
{
int rollno;
st *temp = new st;
st *temp1 = new st;
cout<<"Enter roll number.:";
cin>>rollno;
if(cin.fail()){
cout<<"Not numeric\n";
return 0;
}
temp=hptr;
while(temp)
{
if(temp->roll==rollno)
{
cout<<"Enter grade to update:";
cin>>temp->grade;
return 0;
}
temp1=temp;
temp=temp->next;
}
cout<<"Record not found..!\n";
}
/* search the student */
int search()
{
int rollno;
st *temp = new st;
st *temp1 = new st;
cout<<"Enter roll number:";
cin>>rollno;
if(cin.fail()){
cout<<"Not numeric\n";
return 0;
}
temp=hptr;
cout<<"RollNo.\t\t|Name\t\t|Grade\n";
cout<<"-------------------------------------------\n";
while(temp)
{
if(temp->roll==rollno)
{
cout<<temp->roll<<"\t\t|"<<temp->name<<"\t\t|"<<temp->grade<<"\n";
return 0;
}
temp1=temp;
temp=temp->next;
}
cout<<"Record is not present..!\n";
}
/* Display the record */
void display()
{
cout<<"RollNo.\t\t|Name\t\t|Grade\n";
cout<<"-------------------------------------------\n";
struct st *ptr;
ptr=hptr;
while(ptr)
{
cout<<ptr->roll<<"\t\t|"<<ptr->name<<"\t\t|"<<ptr->grade<<"\n";
ptr=ptr->next;
}
}
Homework Answers
#include<iostream>
#include<stdlib.h>
#include<fstream>
#include<string>
using namespace std;
struct st
{
int roll;
char name[50];
char grade;
struct st* next;
};
struct st* hptr = 0; // declare null header of linked list
int addStudent();
int delete_student();
void display();
int update();
int search();
void save();
void read();
int main()
{
char ch;
int opt;
do
{
cout << "Choose option:\n\t1. Add Student\n"
"\t2. Remove Student\n"
"\t3. Update grade\n"
"\t4. Search Student\n"
"\t5. Display Records\n"
"\t6. Save To Database\n"
"\t7. Read From Database\n";
cin >> opt;
switch (opt)
{
case 1: addStudent();
break;
case 2: delete_student();
break;
case 3: update();
break;
case 4: search();
break;
case 5: display();
break;
case 6: save();
break;
case 7: read();
break;
default:
cout << "Invaild Option, Try again...!\n";
break;
}
cout << "Do you wants another operation(y/n)? : ";
cin >> ch;
} while (ch == 'Y' || ch == 'y');
}
/* Add Student */
int addStudent()
{
st* temp = new st;
st* temp1 = new st;
cout << "Enter roll no:";
cin >> temp->roll;
if (cin.fail()) {
cout << "Not numeric\n";
return 0;
}
cout << "Enter name:";
cin.ignore();
cin.getline(temp->name, 49, '\n');
cout << "Enter grade:";
cin >> temp->grade;
// Head of linked list is null
if (hptr == 0)
{
temp->next = hptr;
hptr = temp;
}
else
{
temp1 = hptr;
while (temp1->next)
temp1 = temp1->next;
temp->next = temp1->next;//NULL
temp1->next = temp;
}
}
/* Delete Student */
int delete_student()
{
int rollno;
st* temp = new st;
st* temp1 = new st;
cout << "Do U wants to delete record ,then enter Roll No.:";
cin >> rollno;
//Rollno is not numeric
if (cin.fail()) {
cout << "Not numeric\n";
return 0;
}
temp = hptr;
while (temp)
{
if (temp->roll == rollno)
{
// searching record is head
if (temp == hptr)
{
hptr = temp->next;
free(temp);
return 0;
}
else
{
temp1->next = temp->next;
free(temp);
return 0;
}
}
temp1 = temp;
temp = temp->next;
}
cout << "Record is not found..!\n";
}
/* Update the grade of the student */
int update()
{
int rollno;
st* temp = new st;
st* temp1 = new st;
cout << "Enter roll number.:";
cin >> rollno;
if (cin.fail()) {
cout << "Not numeric\n";
return 0;
}
temp = hptr;
while (temp)
{
if (temp->roll == rollno)
{
cout << "Enter grade to update:";
cin >> temp->grade;
return 0;
}
temp1 = temp;
temp = temp->next;
}
cout << "Record not found..!\n";
}
/* search the student */
int search()
{
int rollno;
st* temp = new st;
st* temp1 = new st;
cout << "Enter roll number:";
cin >> rollno;
if (cin.fail()) {
cout << "Not numeric\n";
return 0;
}
temp = hptr;
cout << "RollNo.\t\t|Name\t\t|Grade\n";
cout << "-------------------------------------------\n";
while (temp)
{
if (temp->roll == rollno)
{
cout << temp->roll << "\t\t|" << temp->name << "\t\t|" << temp->grade << "\n";
return 0;
}
temp1 = temp;
temp = temp->next;
}
cout << "Record is not present..!\n";
}
/* Display the record */
void display()
{
cout << "RollNo.\t\t|Name\t\t|Grade\n";
cout << "-------------------------------------------\n";
struct st* ptr;
ptr = hptr;
while (ptr)
{
cout << ptr->roll << "\t\t|" << ptr->name << "\t\t|" << ptr->grade << "\n";
ptr = ptr->next;
}
}
void save()
{
// stores the current data of linked list in
database.txt
// format of storage is "'roll' 'name' 'grade'"
ofstream fout("database.txt");
struct st* ptr;
ptr = hptr;
while (ptr)
{
fout << ptr->roll << "\n" << ptr->name << "\n" << ptr->grade << "\n";
ptr = ptr->next;
}
}
void read()
{
// reads from file database.txt
// keeps reading till end of file.
// stores the data in the currect linked list.
// you can use display() to view data that is read
from database.txt.
ifstream fin("database.txt");
while (!fin.eof())
{
st* temp = new st;
st* temp1 = new st;
fin >>
temp->roll;
if (temp->roll < 0)
break;
fin.ignore();
fin.getline(temp->name, 49, '\n');
fin >> temp->grade;
// Head of linked list is null
if (hptr == 0)
{
temp->next = hptr;
hptr = temp;
}
else
{
temp1 = hptr;
while (temp1->next)
temp1 = temp1->next;
temp->next = temp1->next;//NULL
temp1->next = temp;
}
}
}
it also takes input full names, with spaces in add function, and also reads full names from database.txt in read function.
for any query leave a comment here ill get back to you as soon as possible :)
PLEASE DO NOT FORGET TO LEAVE A THUMBS UP! THANKS! :)
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