Reading from a file...

[Azfar Kashif]

in the else if, compiler gives an error saying "undeclared identifier" HELP plz...!

void studentrecord()
{
char sub;
cout<<"\n\nChoose from one of the following subcategories: "<<endl<<endl;
cout<<"\tPress 'a' to search student's information data"<<endl;
cout<<"\tPress 'b' to enter a new record for a student"<<endl<<endl;
cout<<"Sub-category: ";
cin>>sub;

if(sub=='b')
{
fstream TOfile_student;
TOfile_student.open("Student_Record.txt", fstream::in | fstream::out | fstream::app);

char stuname[40];
char rollno[10];
char fathname[40];
char dob[12];
char doe[12];
char dep[8];
char batch[20];
char section [10];
char gpa[50];


cout<<"\n\n\t*STUDENT'S PERSONAL RECORD*"<<endl<<endl;
cout<<"Please, enter the following: "<<endl<<endl;
cout<<"\n\n 1.Student's name: "; cin.ignore(cin.rdbuf()->in_avail(),'\n'); cin.getline (stuname, 40, '\n'); TOfile_student<<"\n\n\t Student's name : "<<stuname<<endl;
cout<<"\n\n 2.Roll #: "; cin.ignore(cin.rdbuf()->in_avail(),'\n'); cin.getline (rollno, 10, '\n'); TOfile_student<<"\t Roll # : "<<rollno<<endl;
cout<<"\n\n 3.Father's name: "; cin.ignore(cin.rdbuf()->in_avail(),'\n'); cin.getline (fathname, 40, '\n'); TOfile_student<<"\t Father's name : "<<fathname<<endl;
cout<<"\n\n 4.Date of birth (dd/mm/yy): "; cin.ignore(cin.rdbuf()->in_avail(),'\n'); cin.getline (dob, 12, '\n'); TOfile_student<<"\t Date of birth : "<<dob<<endl;
cout<<"\n\n 5.Date of enrollment: "; cin.ignore(cin.rdbuf()->in_avail(),'\n'); cin.getline (doe, 12, '\n'); TOfile_student<<"\t Date of enrollment : "<<doe<<endl;
cout<<"\n\n 6.Department: "; cin.ignore(cin.rdbuf()->in_avail(),'\n'); cin.getline (dep, 8, '\n'); TOfile_student<<"\t Department : "<<dep<<endl;
cout<<"\n\n 7.Batch: "; cin.ignore(cin.rdbuf()->in_avail(),'\n'); cin.getline (batch, 20, '\n'); TOfile_student<<"\t Batch : "<<batch<<endl;
cout<<"\n\n 8.Section: "; cin.ignore(cin.rdbuf()->in_avail(),'\n'); cin.getline (section, 10, '\n'); TOfile_student<<"\t Section : "<<section<<endl;
cout<<"\n\n 9.SEMESTER WISE G.P.A "<<endl;
cout<<"(1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th)"; cin.ignore(cin.rdbuf()->in_avail(),'\n'); cin.getline (gpa, 50, '\n'); TOfile_student<<"\t GPA : "<<gpa<<endl;
}

else if(sub=='a')
{

fstream FROMfile_student;
FROMfile_student.open("Student_Record.txt", fstream::in | fstream::out | fstream::app);

while( !FROMfile_student.eof() ) {

FROMfile_student.getline(rollno,10 );
cout<<rollno<<endl;

}

FROMfile_student.close();


}

[hamsterman]

rollno was declared in the if part but you are using it in the else part of your if statement. Move it before the if.
Also, you're missing one }.
Also, when you post code, put it in [code] tags.

[johnbob]

please include the [code] tag when posting source code.

Then "undeclared identifier" is a very generic error, probably resulting of a missing include (iostream for instance)

[Gaminic]

Without the name of the "undeclared identifier", there's no point in reading your code.

Anyway, it means you typed a variable name that isn't declared. Most likely due to a typo.

[Azfar Kashif]

Thanx a lot...@ hamsterman :) solved the problem!

[Azfar Kashif]

There isn't an error anymore or a warning, but when I execute the program, the file does not open... any suggestions why that could be the case?

[hamsterman]

What does "does not open" mean? Are you sure the else part is executed? What is the value of FROMfile_student.is_open() ? Are you sure the file exists?