I can't Delete a specific record from my program.I need Your Help Guys.Thank's in Advance..
#include<iostream>
#include<fstream>
using namespace std;
class teacher{
long long cnicno;
char name[30],fathername[30],address[50],grade[10];
public:
void input()
{
system("cls");
cout<<"Enter CNIC.No without '-' : ";
cin>>cnicno;
cout<<"Enter Name : ";
cin.ignore();
cin.getline(name,30);
cout<<"Enter Father Name : ";
cin.getline(fathername,30);
cout<<"Enter Address : ";
cin.getline(address,50);
cout<<"Enter Grade : ";
cin.getline(grade,10);
}
void output()
{
cout<<"\n\n\n\n\n";
cout<<"CNIC.No : "<<cnicno<<endl;
cout<<"Name : "<<name<<endl;
cout<<"Father Name : "<<fathername<<endl;
cout<<"Address : "<<address<<endl;
cout<<"Grade : "<<grade<<endl;
}
void modify()
{
system("cls");
cout<<"\nRe-Enter Your New Data ";
cout<<"\nEnter New CNIC.No : ";
cin>>cnicno;
cout<<"\nEnter New Name : ";
cin.ignore();
cin.getline(name,30);
cout<<"\nEnter New Father Name : ";
cin.getline(fathername,30);
cout<<"\nEnter New Address : ";
cin.getline(address,50);
cout<<"\nEnter New Grade : ";
cin.getline(grade,10);
}
long long getcnicno()
{
return cnicno;
}
};
void writedata()
{
system("cls");
ofstream outfile;
teacher t1;
outfile.open("teacherdata.txt",ios::out|ios::app);
t1.input();
outfile.write(reinterpret_cast<char*>(&t1),sizeof(teacher));
cout<<"\nData Has Been Writen On File ";
}
void readdata()
{
system("cls");
ifstream infile;
teacher t1;
infile.open("teacherdata.txt",ios::in);
if(!infile)
{
cout<<"No File Found Plz First Enter Data ";
}
else
{
infile.read(reinterpret_cast<char*>(&t1),sizeof(teacher));
while(!infile.eof())
{
t1.output();
infile.read(reinterpret_cast<char*>(&t1),sizeof(teacher));
}
cout<<"\n\nRecords Finished ";
}
system("pause");
}
void deleterecord()
{
fstream infile,outfile;
teacher t1;
long long check;
int found=0;
cout<<"Enter CNIC.No : ";
cin>>check;
infile.open("teacherdata.txt",ios::in);
if(!infile)
{
cout<<"No File Found";
}
else
{
outfile.open("temp.txt",ios::out);
infile.seekg(0,ios::beg);
infile.read(reinterpret_cast<char*>(&t1),sizeof(teacher));
while(!infile.eof())
{
if(t1.getcnicno()!=check)
{
outfile.write(reinterpret_cast<char*>(&t1),sizeof(teacher));
}
}
remove("teacherdata.txt");
rename("temp.txt","teacherdata.txt");
outfile.close();
infile.close();
}
}
void deletefile()
{
char confirm;
fstream file;
file.open("teacherdata.txt");
cout<<"Your ALL DATA will be LOST.Want to continue?? (y/n) ";
cin>>confirm;
if(confirm=='y'|confirm=='Y')
{
remove("teacherdata.txt");
}
}
int main()
{
int option;
do
{
system("cls");
cout<<"\n\n\t1 . Enter New Data ";
cout<<"\n\n\t2 . Show All Data ";
cout<<"\n\n\t3 . Delete Specific Record ";
cout<<"\n\n\t4 . Delete Complte Record ";
cout<<"\n\n\t5 . Quit Program ";
cout<<"\n\n\tYour Option (1-5) ";
cin>>option;
switch(option)
{
case 1:
writedata();
break;
case 2:
readdata();
break;
case 3:
deleterecord();
break;
case 4:
deletefile();
break;
case 5:
cin.get();
default:
cout<<"\n\n\tInvalid Selection ";
}
}while(option!=5);
cout<<"\n\nThank's for Using Program";
return 0;
}
