Question

This laboratory is designed to get you started with the project and random access file I/O.

1. Open your source file and write or copy the code for the class interface for the Sdisk.

   Class Sdisk
   {
   public :
   Sdisk(string diskname, int numberofblocks, int blocksize);
   int getblock(int blocknumber, string& buffer);
   int putblock(int blocknumber, string buffer);
   int getnumberofblocks(); // accessor function
   int getblocksize(); // accessor function
   private :
   string diskname;        // file name of software-disk
   int numberofblocks;     // number of blocks on disk
   int blocksize;          // block size in bytes
   };

2. You can copy a sample main program from here.

   // You can use this to test your Sdisk class 
   
   int main()
   {
     Sdisk disk1("test1",16,32);
     string block1, block2, block3, block4;
     for (int i=1; i<=32; i++) block1=block1+"1";
     for (int i=1; i<=32; i++) block2=block2+"2";
     disk1.putblock(4,block1);
     disk1.getblock(4,block3);
     cout << "Should be 32 1s : ";
     cout << block3 << endl;
     disk1.putblock(8,block2);
     disk1.getblock(8,block4);
     cout << "Should be 32 2s : ";
     cout << block4 << endl;;
   }

3. Create function stubs (functions with no code) for the class functions.
4. Work first on the constructor that creates the Sdisk.
5. Now work on putblock to open the file and write a block.
6. Finally work on getblock to open the file and get a block.
7. Now test with the example main program.

Answer 1

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


Class Sdisk
{
public :
Sdisk(string diskname, int numberofblocks, int blocksize)
{diskname=block;
numberofblocks=4;
blocksize=4;
}

int getblock(int blocknumber, string& buffer);
int putblock(int blocknumber, string buffer);
int getnumberofblocks(); // accessor function
int getblocksize(); // accessor function
void stubs();
private :
string diskname;        // file name of software-disk
int numberofblocks;     // number of blocks on disk
int blocksize;          // block size in bytes
};

int Sdisk::putblock(int blocknumber,string& buffer)

{ ifstream f1;

f1.open("file.DAT");

if(!f1)

{

cout<<"ERROR IN OPENING FILE file.DAT|n";

exit(102);

}

f1.get(buffer);

f1.close();

}

int Sdisk::getblock(int blocknumber, string buffer)

{

ofstream f2;

f2.open("file2.DAT);

cout<<"DATA IN FILE";

while(!f2.eof())

{

f2.get(buffer);

cout<<buffer;

}

f2.close();

}

void Sdisk::stubs()

{

}

int main()

{
  Sdisk disk1("test1",16,32);
  string block1, block2, block3, block4;
  for (int i=1; i<=32; i++) block1=block1+"1";
  for (int i=1; i<=32; i++) block2=block2+"2";
  disk1.putblock(4,block1);
  disk1.getblock(4,block3);
  cout << "Should be 32 1s : ";
  cout << block3 << endl;
  disk1.putblock(8,block2);
  disk1.getblock(8,block4);
  cout << "Should be 32 2s : ";
  cout << block4 << endl;;
}