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-   -   To Display Sequential Records of non-fixed length (http://www.go4expert.com/forums/display-sequential-records-fixed-length-t7941/)

cherries 20Dec2007 07:29

To Display Sequential Records of non-fixed length
 
Hi I am a newbie in C++. I need some help here for my homework.

I need to design a staff information enquiry program which can display information of staff sequentially in staff database with the functions of forward one record, backward one record, go to the first record and go to the last record. The info of staff in the database includes name, gender, age, staff number, office phone number and office room number.

Other requirements:
I must have Base class to encase name, gender and age and a Derived class to encase staff number, office phone number and office room number.

-The database (text file) looks like this:

Dr Sean Kingston
M
32
f10000
51790689
B123
Ms Mandy Moore
F
28
f10001
52721423
BC2345
Mr Alexander Graham Bell
M
30
f10003
53792162
B234
Mr Thomas Alfa Edison
M
31
f10004
59097123
BD78910

- The code that I have written:
It displays the info successfully, but I dunno display the next record, the previous record as the number of characters in each field may differ. Do I have to open the file in binary mode? How do we do that? Sample code is appreciated. Thanks

Code:

#include <iostream>
#include <string>
#include <fstream>
using namespace std;

class Base
{
protected:
string name;
char gender;
int age;
};

class Derived : public Base
{
protected:
string staffno;
int telpno;
string roomno;
public:
void enquiry (void);
};

void Derived::enquiry ()
{
int n;
fstream f;
f.open("info.txt");
while (1)
{
getline (f, name);
f >> gender;
f >> age;
f >> staffno;
f >> telpno;
f >> roomno;

cout << "Name: " << name;
cout << "\nGender: " << gender;
cout << "\nAge: " << age;
cout << "\nStaff No.: " << staffno;
cout << "\nPhone No.: " << telpno;
cout << "\nRoom No.: " << roomno << endl <<endl;

cout << "<1> previous \t <2> next \t <0> exit\n";
cin >> n;

// I dunno what to do from here onwards..

}
f.close();

}

void main ()
{
Derived staff;
staff.enquiry();
}


cherries 20Dec2007 15:26

Re: To Display Sequential Records of non-fixed length
 
sooolveeed! thanks~~


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