d file handling in search and delete record to this C++ Program. #include #include #include #include #include using namespace std; bool check = true; struct no
Add file handling in search and delete record to this C++ Program.
#include<iostream>
#include<fstream>
#include<cctype>
#include<sstream>
#include<string>
using namespace std;
bool check = true;
struct node //structure of node //
{
int rollNo;
char name[20];
char address[40];
char gender[20];
char department[20];
int year;
char dob[20];
node *next;
} *head, *lastptr;
void add() //Adds record of student//
{
//initialization was not proper
//changed it to the correct one
node *p = (struct node*) malloc(sizeof(struct node));
cout << "Enter ID number of student:" << endl;
cin >> p->rollNo;
fflush(stdin);
cout << "Enter name of student:" << endl;
gets(p->name);
fflush(stdin);
cout << "Enter address of student:" << endl;
gets(p->address);
fflush(stdin);
cout << "Enter birthday of student:" << endl;
gets(p->dob);
fflush(stdin);
cout << "Enter gender of student:" << endl;
gets(p->gender);
fflush(stdin);
cout << "Enter department of student:" << endl;
gets(p->department);
fflush(stdin);
cout << "Enter Training year of student:" << endl;
cin >> p->year;
fflush(stdin);
p->next = NULL;
if (check) {
head = p;
lastptr = p;
check = false;
} else {
lastptr->next = p;
lastptr = p;
}
// Writing data to file -------------------------------------------------------
// Remove the '------' lines if not required
ofstream file("student_data.txt");
file << "------------------------------------------------------" << endl;
file << "Student Id: " << lastptr->rollNo << endl;
file << "Student Name: " << lastptr->name << endl;
file << "Student Address: " << lastptr->address << endl;
file << "Student DOB: " << lastptr->dob << endl;
file << "Student Gender: " << lastptr->gender << endl;
file << "Student Department: " << lastptr->department << endl;
file << "Student Training Year: " << lastptr->year << endl;
file << "------------------------------------------------------" << endl
<< endl << endl;
// ------------------------------
cout << endl << "Recored Entered" << endl;
}
void modify() //modifies record of student//
{
node *ptr = (struct node*) malloc(sizeof(struct node));
node *prev = (struct node*) malloc(sizeof(struct node));
node *current = (struct node*) malloc(sizeof(struct node));
int roll_no;
cout << "Enter ID number to search:" << endl;
cin >> roll_no;
prev = head;
current = head;
while (current->rollNo != roll_no) {
prev = current;
current = current->next;
}
ptr = new node;
fflush(stdin);
cout << "Enter ID number of student:" << endl;
cin >> ptr->rollNo;
fflush(stdin);
cout << "Enter name of student:" << endl;
gets(ptr->name);
fflush(stdin);
cout << "Enter address of student:" << endl;
gets(ptr->address);
fflush(stdin);
cout << "Enter birthday of student:" << endl;
gets(ptr->dob);
fflush(stdin);
cout << "Enter gender of student:" << endl;
gets(ptr->gender);
fflush(stdin);
cout << "Enter department of student:" << endl;
gets(ptr->department);
fflush(stdin);
cout << "Enter Training year of student:" << endl;
cin >> ptr->year;
fflush(stdin);
prev->next = ptr;
ptr->next = current->next;
current->next = NULL;
delete current;
cout << endl << "Recored Modified";
}
void search() //searches record of student//
{
node *prev = (struct node*) malloc(sizeof(struct node));
node *current = (struct node*) malloc(sizeof(struct node));
int roll_no;
cout << "Enter ID Number to search:" << endl;
cin >> roll_no;
prev = head;
current = head;
while (current->rollNo != roll_no) {
prev = current;
current = current->next;
}
cout << "\nID No:";
cout << current->rollNo;
cout << "\nname: ";
puts(current->name);
cout << "\nAddress: ";
puts(current->address);
cout << "\nGender: ";
puts(current->gender);
cout << "\ndepartment: ";
puts(current->department);
cout << "\nYear: ";
cout << current->year;
cout << "\nDate of birth: ";
puts(current->dob);
}
void del() {
node *ptr = (struct node*) malloc(sizeof(struct node));
node *prev = (struct node*) malloc(sizeof(struct node));
node *current = (struct node*) malloc(sizeof(struct node));
int roll_no;
cout << "Enter ID Number to Delete:" << endl;
cin >> roll_no;
prev = head;
current = head;
while (current->rollNo != roll_no) {
prev = current;
current = current->next;
}
prev->next = current->next;
current->next = NULL;
//there was error in the line
//added square brackets
delete[] current;
cout << endl << "Recored Deleted";
}
int main() {
int x;
do {
cout << "1--->Press '1' to add New record:" << endl;
cout << "2--->Press '2' to search a record:" << endl;
cout << "3--->Press '3' to modify a record:" << endl;
cout << "4--->Press '4' to delete a record:" << endl;
cout << "5--->Press '5' to exit:" << endl;
cin >> x;
switch (x) {
case 1:
system("cls");
add();
break;
case 2:
system("cls");
search();
break;
case 3:
system("cls");
modify();
break;
case 4:
system("cls");
del();
break;
case 5:
exit(0);
break;
default:
cout << "Enter a valid option. \n";
break;
}
} while (1);
}
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