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INSERTRE.CPP
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INSERTRE.CPP
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#include<iostream.h>
#include<conio.h>
#include<stdio.h>
#include<fstream.h>
#include<stdlib.h>
class student
{ int roll;
char name[10];
float marks;
public:
void getdata()
{ cout<<"\n enter the roll no.\n";
cin>>roll;
cout<<"\n enter name of student \n";
cin>>name;
cout<<"\n enter the marks|n ";
cin>>marks;
}
int get_RNO()
{return roll;
}
};
void main()
{ clrscr();
char last= 'y';
student S1,S2;
fstream file("student.dat",ios::in|ios::binary);
if(!file)
{ cout<<"\n cant open file";
exit(0);
}
fstream tmp("temp.dat",ios::out|ios::binary);
S2.getdata();
file.seekg(0);
while(file.read((char*)&S1,sizeof(S1)))
{
if(S2.get_RNO()<=S1.get_RNO())
{tmp.write((char*)&S2,sizeof(S2));
last='n';
break;
}
else
{tmp.write((char*)&S1,sizeof(S1)); }
}
if (last=='y')
tmp.write((char*)&S2,sizeof(S2));
else if(!file.eof())
{ while(!file.eof())
{
tmp.write((char*)&S1, sizeof(S1));
file.read((char*)&S1, sizeof(S1));
}
}
file.close();
tmp.close();
remove("student.dat");
rename("temp.dat","student.dat");
getch();
}