Retrieve program r andomAccess.cpp and the data file proverb.txt Exercise 1: Fil

Question

Retrieve program randomAccess.cpp and the data file proverb.txt

Exercise 1: Fill in the code as indicated by the comments in bold. Proverb.txt contains the following information:

Now Is The Time fOr All GoOd Men to come to the aid of their Family

Sample Run:

The read position is currently at byte 0

Enter an offset from the current position: 4

The character read is I

If you would like to input another offset enter a Y y

The read position is currently at byte 5

Enter an offset from the current position: 2

The character read is T

If you would like to input another offset enter a Y y

The read position is currently at byte 8

Enter an offset from the current position: 6

The character read is e

If you would like to input another offset enter a Y y

The read position is currently at byte 15

Enter an offset from the current position: 44

The character read is r

If you would like to input another offset enter a Y y

The read position is currently at byte 60

Enter an offset from the current position: 8

The character read is r

If you would like to input another offset enter a Y n

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

int main()
{
fstream inFile("proverb.txt", ios::in);
long offset;
char ch;
char more;

do
{
  // Fill in the code to write to the screen
  // the current read position (with label)

  cout << "Enter an offset from the current read position: ";
  cin >> offset;

  // Fill in the code to move the read position "offset" bytes
  // from the current read position.

  // Fill in the code to get one byte of information from the file
  // and place it in the variable "ch".

  cout << "The character read is " << ch << endl;
  cout << "If you would like to input another offset enter a Y"
    << endl;

  cin >> more;

  // Fill in the code to clear the eof flag.

} while (toupper(more) == 'Y');

inFile.close();
return 0;
}

Explanation / Answer

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

int main()
{
fstream inFile("c:\proverb.txt", ios::in);
long offset;
char ch;
char more;
int currPosition = 0;
do
{    
     cout<< "The read position is currently at byte "<<currPosition<<endl;
     cout << "Enter an offset from the current read position: ";
     cin >> offset;
     currPosition = currPosition + offset + 1;
     inFile.seekg(offset, ios::cur);
     inFile.get(ch);  
     cout << "The character read is " << ch << endl;
     cout << "If you would like to input another offset enter a Y"<< endl;
     cin >> more;
     if(inFile.eof())
     {
        inFile.seekg(0, ios::beg);
        currPosition = 0;
     }
} while (toupper(more) == 'Y');

inFile.close();
return 0;
}

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