void
File::operator- ()
{
char c; // f2 will be this
fp.open(fn,ios::in);
int temp = fp.rdstate();
cout <<endl<< "after opening in read mode ; " <<temp;
if(temp != 0)
{
fp.clear();
}
fp.close();
fp.open (fn, ios::in | ios::out);
int t = fp.rdstate ();
cout << "\n In oprt - t=" << t;
if (t == 0)
{
fp.seekg (0, ios::beg);
while (1)
{
fp.get (c);
cout <<endl<< "c = " << c;
if (fp.eof ())
break;
if (!fp.eof ())
{
if (c >= 'A' && c <= 'Z')
{
/*
AbCFdEGGD
*/
c += 32;
fp.seekg (-1, ios::cur);
fp.put (c);
int temp = fp.rdstate();
cout << endl<<"after putting '" << c << "' into file : "<<temp;
getchar();
}
else if (c >= 'a' && c <= 'z')
{
c -= 32;
fp.seekg (-1, ios::cur);
fp.put (c);
int temp = fp.rdstate();
cout << endl<<"after putting '" << c << "' into file : "<<temp;
getchar();
}
}
}
fp.close ();
}
}
void student::pack()
{
int cnt,pos;
string temp;
string buf = usn + "|" + name + "|" + sem + "|";
if(buf.length() > 45)
{ error(2);
return;
}
while(buf.length()<46)
buf += '_';
pos = hash(usn);
fp.open("record11.txt",ios::in);
if(!fp)
error(1);
fp.seekg(pos,ios::beg);
getline(fp,temp);
fp.close();
cnt = temp[0]-48;
if(cnt == 3)
{
error(3);
return;
}
fp.open("record11.txt",ios::out|ios::in);
if(!fp)
error(1);
if(cnt<0)
{
fp.seekp(pos,ios::beg);
fp.put('1');
pos=pos+1;
}
else if(cnt==1)
{
fp.seekp(pos,ios::beg);
fp.put('2');
pos=pos+48;
}
else if(cnt==2)
{
fp.seekp(pos,ios::beg);
fp.put('3');
pos=pos+95;
}
cout<<"inserting at :"<<pos;
fp.seekp(pos,ios::beg);
fp<<buf<<endl;
fp.close();
}
/**
Put an unsigned integer to a stream.
@param stream the stream
@param value the value to put
@param bytes the number of bytes for the value
*/
void put_unsigned_int(fstream& stream, int value, int bytes)
{
int temp = value;
for (int i = 1; i <= bytes; i++)
{
stream.put(temp % 256);
temp = temp / 256;
}
}
void
myfile::append ()
{
char data;
fp.seekg (0, ios::end);
cout << "\n\t\tEnter the characters : ['~' is delimiter]";
while ((data = getchar ()) != '~')
fp.put(data);
}
void
myfile::append ()
{
char data;
fp.seekg (0, ios::end);
cout << "\n\t\tEnter the characters \n\n\t\t '~' is termination character: ";
while ((data = getchar ()) != '~')
fp.put(data);//writes data to the file
}
void File::excise(char line[]) {
getName(line);
int address = hash(line), counter = 0;
bool done = false, removed = false;
char name2[recordLen+1];
outfile.clear();
outfile.seekg(address,ios::beg);
while (!done && outfile.get(name2,recordLen+1)) {
if (!strcmp(line,name2)) {
outfile.clear();
outfile.seekg(address+counter*recordLen,ios::beg);
outfile.put(delMarker);
done = removed = true;
}
else counter++;
if (counter == bucketSize)
done = true;
else outfile.seekg(address+counter*recordLen,ios::beg);
}
if (!removed) {
done = false;
counter = 0;
overflow.clear();
overflow.seekg(0,ios::beg);
while (!done && overflow.get(name2,recordLen+1)) {
if (!strcmp(line,name2)) {
overflow.clear();
overflow.seekg(counter*recordLen,ios::beg);
overflow.put(delMarker);
done = removed = true;
}
else counter++;
overflow.seekg(counter*recordLen,ios::beg);
}
}
if (!removed)
cout << line << " is not in database\n";
}
void FM_database::put_int( fstream& fio , index_t i )
{
string s = iexts( i );
for (size_t i=0; i<sizeof(index_t); i++)
fio.put( s[i] );
}
