wherever u see ... remove that . and put << in that place.
if you see .. then remove that . and put < in that place..
12. Write a C++ program to write student objects with Variable - Length
records using any suitable record structure and to read from this file a
student record using RRN.

#include..stdio.h>
#include..stdlib.h>
#include..iostream.h>
#include..fstream.h>
#include..conio.h>
#include..string.h>
#include..iomanip.h>

class student
{
public: char name[15],usn[15],age[5],sem[5],branch[15],buffer[100];
};

void search()
{
char usn[15];
int i=0;
student s1[100];
cout..."\nEnter the usn to be searched: "; cin>>usn;
fstream in;
in.open("student.txt",ios::in);
if(!in)
{
cout..."\ncannot open the file in output mode";
getch();
exit(0);
}
i=0;
printf("Name\tUsn\tAge\tSem\tBranch\n");
while(!in.eof())
{
in.getline(s1[i].name,15,'|');
in.getline(s1[i].usn,15,'|');
in.getline(s1[i].age,5,'|');
in.getline(s1[i].sem,5,'|');
in.getline(s1[i].branch,15,'\n');
i++;
}
for(int j=0; j..i-1; j++)
{
if(strcmp(usn,s1[j].usn)==0)
{
printf("\n Record found");
printf("\n%s\t%s\t%s\t%s\t%s",s1[j].name,s1[j].usn,s1[j].age,s1[j].sem,s1[j].branch);
return;
}
}
cout..."\nRecord not found";
return;
}

void writeRecord()
{
fstream app;
student s;
app.open("student.txt",ios::app);
if(!app)
{
cout..."cannot open the file in output mode";
getch();
exit(0);
}
cout..."\nEnter the student name: "; cin>>s.name;
cout..."\nEnter the usn: "; cin>>s.usn;
cout..."\nEnter the age: "; cin>>s.age;
cout..."\nEnter the sem: "; cin>>s.sem;
cout..."\nEnter the branch: "; cin>>s.branch;

strcpy(s.buffer,s.name); strcat(s.buffer,"|");
strcat(s.buffer,s.usn); strcat(s.buffer,"|");
strcat(s.buffer,s.age); strcat(s.buffer,"|");
strcat(s.buffer,s.sem); strcat(s.buffer,"|");
strcat(s.buffer,s.branch); strcat(s.buffer,"\n");
app...s.buffer;
app.close();
}


void main()
{
clrscr();
int ch;
fstream out;
out.open("student.txt",ios::out);
if(!out)
{
cout..."\nCannot open the file in output mode";
getch();
exit(0);
}
out.close();
for(;;)
{
cout..."\nO:exit"
..."\n1:Insert"
..."\n2:Search"
..."\nEnter the choice = "; cin>>ch;
switch(ch)
{
case 1: writeRecord();break;
case 2: search();break;
case 0: exit(0);
default: cout..."\nInvalid option";
}
}
}