#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <iostream.h>
#include <fstream.h>

void tread(istream* s);
void twrite(ostream* s);

int main(int narg, char ** arg)
{
if (narg < 2) {
  cout << "Usage: tios r/w" << endl;
  exit(0);
  }

istream* is;
ostream* os;
if (arg[1][0] == 'r') {
// is = new ifstream("tios.dat", ios::in | ios::binary);
 is = new ifstream("tios.dat", ios::in );
 tread(is);
 delete is;
 }
else {
// os = new ofstream("tios.dat", ios::out | ios::binary);  
 os = new ofstream("tios.dat", ios::out );  
 twrite(os);
 delete(os);
 }

}

void twrite(ostream* s)
{
int i;
int iv;
float fv;
double dv;
for(i=0; i<10; i++) {
  iv = 1000+i*50;
  fv = iv+2.5;
  dv = iv+3.141596;
  s->write((char const*)(&iv), sizeof(int));
  s->write((char const*)(&fv), sizeof(float));
  s->write((char const*)(&dv), sizeof(double));
  cout << "twrite " << i << " IV= " << iv << " FV= " << fv << " DV= " << dv << endl;
  }
}

void tread(istream* s)
{
int i;
int iv;
float fv;
double dv;
long pos;
for(i=0; i<10; i++) {
  pos = s->tellg();
  s->read((char *)(&iv), sizeof(int));
  s->read((char *)(&fv), sizeof(float));
  s->read((char *)(&dv), sizeof(double));
  cout << "tread " << i << " IV= " << iv << " FV= " << fv << " DV= " << dv 
       << " Pos= " << pos << endl;
  }

s->seekg(-(sizeof(int)+sizeof(float)+sizeof(double)), ios::end);
pos = s->tellg();
s->read((char *)(&iv), sizeof(int));
s->read((char *)(&fv), sizeof(float));
s->read((char *)(&dv), sizeof(double));
i = 9;
cout << "Seek-tread " << i << " IV= " << iv << " FV= " << fv << " DV= " << dv 
     << " Pos= " << pos << endl;
s->seekg((sizeof(int)+sizeof(float)+sizeof(double)), ios::beg);
pos = s->tellg();
s->read((char *)(&iv), sizeof(int));
s->read((char *)(&fv), sizeof(float));
s->read((char *)(&dv), sizeof(double));
i = 1;
cout << "Seek-tread2 " << i << " IV= " << iv << " FV= " << fv << " DV= " << dv 
     << " Pos= " << pos << endl;

}