#include<iostream.h>
#include<conio.h>
#include<fstream.h>
#include<string.h>
#include<stdio.h>
/* class student
{
public:char name[10],rollno[10],marks[10],attendence[10];
int length;
// char len[9];
void getdata()
{
cout<<"enter student name:"<<endl;
gets(name);
cout<<"enter student rollno:"<<endl;
cin>>rollno;
cout<<"enter student marks:"<<endl;
cin>>marks;
cout<<"enter student attendence:"<<endl;
cin>>attendence;
length=strlen(name)+strlen(rollno)+strlen(marks)+strlen(attendence)+4;
}
};
int main()
{
int a[10],n,m,k,j=2;
char ch,len[10];
clrscr();
student s;
fstream f,f1;
f.open("direct.ace",ios::in|ios::out|ios::trunc);
cout<<"enter how many records do u want:"<<endl;
cin>>n;
for(int i=0;i<n;i++)
{
s.getdata();
f<<s.length;
f<<s.name<<"|";
f<<s.rollno<<"|";
f<<s.marks<<"|";
f<<s.attendence<<"#";
len[i]=s.length;
a[0]=0;
a[1]=0;
a[j]=f.tellp();
j++;
}
for(i=0;i<=n;i++)
{
f.open("index.rec",ios::in|ios::out);
f<<s.name<<"\t";
f<<s.length<<endl;
}
f.close();
f.open("direct.ace",ios::in|ios::out);
cout<<"enter access record number:"<<endl;
cin>>m;
if(m<=n)
{
k=a[m];
f.seekg(k,ios::beg);
while(k<a[m+1])
{
f.get(ch);
cout<<ch;
k++;
}
}
else
{
cout<<"ur record does not accessible"<<endl;
}
f.close();
getch();
return 0;
} */
class student
{
public:char name[10],marks[10],attendence[10];
int length,rollno;
void getdata()
{
cout<<"enter student name:"<<endl;
gets(name);
cout<<"enter student rollno:"<<endl;
cin>>rollno;
cout<<"enter student marks:"<<endl;
cin>>marks;
cout<<"enter student attendence:"<<endl;
cin>>attendence;
length=strlen(name)+sizeof(rollno)+strlen(marks)+strlen(attendence)+4;
}
};
int main()
{
int n,a[20],r[10],temp,k,g;
clrscr();
cout<<"enter how many reords do u want:"<<endl;
cin>>n;
student s;
fstream f,f1;
f.open("datafile.d",ios::in|ios::out|ios::trunc);
f1.open("index.i",ios::in|ios::out|ios::trunc);
for(int i=1;i<=n;i++)
{
s.getdata();
r[i]=f.tellp();
// f.tellp();
f<<s.rollno<<"|";
a[i]=s.rollno;
f<<s.name<<"|";
f<<s.marks<<"|";
f<<s.attendence<<"#";
}
for(i=1;i<=n;i++)
{
for(int j=i+1;j<=n;j++)
{
if(a[i]>a[j])
{
temp=a[i];
a[i]=a[j];
a[j]=temp;
temp=r[i];
r[i]=r[j];
r[j]=temp;
}
}
}
// f1<<"key"<<"\t"<<"referance"<<endl;
for(i=1;i<=n;i++)
{
// f1<<a[i]<<"\t"<<r[i];
f1<<a[i]<<"\t";
f1<<r[i]<<endl;
}
cout<<"enter ur direct access record roll number:"<<endl;
cin>>k;
//while(f1.read((char *)&r[i],sizeof(r[i])))
// while(f1)
/* {
// int p;
//if((f1>>s.rollno)==k)
f1>>s.rollno;
int p=s.rollno;
if(k==p)
{
f.seekg(r[k],ios::beg);
int h=r[k];
while(h<r[k+1])
{
char ch;
f.get(ch);
cout<<ch;
h++;
}
}
}
getch();
return 0;
} */
for(i=1;i<=n;i++)
{
f1>>a[i];
int p=a[i];
if(p==k)
{
f.seekg(r[i],ios::beg);
g=s.length;
while(g>0)
{
char ch;
f.get(ch);
cout<<ch;
g--;
} }
}
getch();
return 0;
}
#include<conio.h>
#include<fstream.h>
#include<string.h>
#include<stdio.h>
/* class student
{
public:char name[10],rollno[10],marks[10],attendence[10];
int length;
// char len[9];
void getdata()
{
cout<<"enter student name:"<<endl;
gets(name);
cout<<"enter student rollno:"<<endl;
cin>>rollno;
cout<<"enter student marks:"<<endl;
cin>>marks;
cout<<"enter student attendence:"<<endl;
cin>>attendence;
length=strlen(name)+strlen(rollno)+strlen(marks)+strlen(attendence)+4;
}
};
int main()
{
int a[10],n,m,k,j=2;
char ch,len[10];
clrscr();
student s;
fstream f,f1;
f.open("direct.ace",ios::in|ios::out|ios::trunc);
cout<<"enter how many records do u want:"<<endl;
cin>>n;
for(int i=0;i<n;i++)
{
s.getdata();
f<<s.length;
f<<s.name<<"|";
f<<s.rollno<<"|";
f<<s.marks<<"|";
f<<s.attendence<<"#";
len[i]=s.length;
a[0]=0;
a[1]=0;
a[j]=f.tellp();
j++;
}
for(i=0;i<=n;i++)
{
f.open("index.rec",ios::in|ios::out);
f<<s.name<<"\t";
f<<s.length<<endl;
}
f.close();
f.open("direct.ace",ios::in|ios::out);
cout<<"enter access record number:"<<endl;
cin>>m;
if(m<=n)
{
k=a[m];
f.seekg(k,ios::beg);
while(k<a[m+1])
{
f.get(ch);
cout<<ch;
k++;
}
}
else
{
cout<<"ur record does not accessible"<<endl;
}
f.close();
getch();
return 0;
} */
class student
{
public:char name[10],marks[10],attendence[10];
int length,rollno;
void getdata()
{
cout<<"enter student name:"<<endl;
gets(name);
cout<<"enter student rollno:"<<endl;
cin>>rollno;
cout<<"enter student marks:"<<endl;
cin>>marks;
cout<<"enter student attendence:"<<endl;
cin>>attendence;
length=strlen(name)+sizeof(rollno)+strlen(marks)+strlen(attendence)+4;
}
};
int main()
{
int n,a[20],r[10],temp,k,g;
clrscr();
cout<<"enter how many reords do u want:"<<endl;
cin>>n;
student s;
fstream f,f1;
f.open("datafile.d",ios::in|ios::out|ios::trunc);
f1.open("index.i",ios::in|ios::out|ios::trunc);
for(int i=1;i<=n;i++)
{
s.getdata();
r[i]=f.tellp();
// f.tellp();
f<<s.rollno<<"|";
a[i]=s.rollno;
f<<s.name<<"|";
f<<s.marks<<"|";
f<<s.attendence<<"#";
}
for(i=1;i<=n;i++)
{
for(int j=i+1;j<=n;j++)
{
if(a[i]>a[j])
{
temp=a[i];
a[i]=a[j];
a[j]=temp;
temp=r[i];
r[i]=r[j];
r[j]=temp;
}
}
}
// f1<<"key"<<"\t"<<"referance"<<endl;
for(i=1;i<=n;i++)
{
// f1<<a[i]<<"\t"<<r[i];
f1<<a[i]<<"\t";
f1<<r[i]<<endl;
}
cout<<"enter ur direct access record roll number:"<<endl;
cin>>k;
//while(f1.read((char *)&r[i],sizeof(r[i])))
// while(f1)
/* {
// int p;
//if((f1>>s.rollno)==k)
f1>>s.rollno;
int p=s.rollno;
if(k==p)
{
f.seekg(r[k],ios::beg);
int h=r[k];
while(h<r[k+1])
{
char ch;
f.get(ch);
cout<<ch;
h++;
}
}
}
getch();
return 0;
} */
for(i=1;i<=n;i++)
{
f1>>a[i];
int p=a[i];
if(p==k)
{
f.seekg(r[i],ios::beg);
g=s.length;
while(g>0)
{
char ch;
f.get(ch);
cout<<ch;
g--;
} }
}
getch();
return 0;
}
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