Question

c++ program

8. Array/File Functions 

Write a function named arrayToFile. The function should accept three arguments: the name of a file, a pointer to an int array, and the size of the array. The function should open the specified file in binary mode, write the contents of the array to the file, and then close the file. 

Write another function named fileToArray. This function should accept three argu- ments: the name of a file, a pointer to an int array, and the size of the array. The function should open the specified file in binary mode, read its contents into the array and then close the file 

Write a complete program that demonstrates these functions by using the arrayToFile function to write an array to a file, and then using the fileToArray function to read the data from the same file. After the data are read from the file into the array, display the array's contents on the screen 

Additional Requirements: 

You may not use global variables. 

You may only write to the file once. 

You may only read from the file once. 

 The functions should work with arrays of any length.

Hints:

- Use separate arrays for the source and destination.

- Check the file size after calling the arrayToFile function. It should not be 0 if everything worked fine.

- You will not be able to view the contents of the file with a text editor. It is a binary file, not a text file.

- Write and test each function one at a time.

Answer 1

#include
#include
#include
#include
using namespace std;

void arrayToFile(fstream&);
void fileToArray(fstream&);

const int SIZE = 10;
int myArray[SIZE] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

int main()
{
   fstream file;
   arrayToFile(file);
   fileToArray(file);
   return 0;
}

void arrayToFile(fstream& file)
{
   file.open("input.txt", ios::out | ios::binary | ios::trunc);
   for (int i = 0; i < SIZE; i++)
   {
       file << myArray[i] << "\n";
   }
   file.close();
   cout << "We have written the array to file in binary" << endl;
}

void fileToArray(fstream& file)
{
   file.open("input.txt", ios::in | ios::binary | ios::beg);
   string line;
   for (int i = 0; i < SIZE; i++)
   {
       file >> line;
       cout << line << endl;
   }
}