Question

java

Binary files The binary file data.dat contains characters and numbers- it has 16 characters, followed by numbers of type int alternating with numbers of type double -so after the first 16 characters, there will be an int, followed by a double, followed by an int, followed by a double, and so on. Write a program to open the file and until the end of file is reached, read in the values in the appropriate data types (that is, read the characters as characters, integers as integers and the doubles as doubles), process them, and output the following separately for each type of value: 1. The string that is all of the characters 2. The total number of integers in the file 3. The total number of doubles in the file 4. The sum of all of the integers 5. The sum of all of the doubles 6. The average, min, and max of the integers 7. The average, min, and max of the doubles To do this, envision what the contents of the file look like. 16 characters, followed by alternating ints and doubles, so for example: ch ch ch ch ch ch ch ch ch ch ch ch ch ch ch ch int double int double int double, and so on. Recall that type char represents individual characters. In the file, the characters will be separated by a space. Remember that in a binary file, data is stored using the number of bits that are used to represent a type. So if when you read your data, if your reading gets out of sync by reading the wrong type (or the wrong number of bits), your data will be compromised. That means it will not read what is really in the file. To achieve the goals above, loop and read in 16 characters, then loop and read in an int followed by a double. For the numeric types, process as you go do not use an array or a collection to store your data. References Java documentation for ObjectinputStream class Using a try catch block with an EOFException is probably the easiest way to terminate the file read because you do not know how much to read. Here is some pseudocode for the main process. // initialize stuff try f Open the file and create the object stream, named myObjStream in this pseudocode /read the 16 characters and store in a string try f //read an int using myObjStream.readIntO; /I add int to sum / add 1 to counter // if it is the largest int, update the largest int //if it is the smallest int, update smallest //read a double using myObjStream.readDouble0; // perform the same actions for the double ; catch (EOFException e) //Close the file //Calculate averages //Display all the results ) catch (IOException e) /l print error message about opening file or just e.getMessage0 End of d

Answer 1

// Java program to read a binary file containing 16 characters and alternating sequence of int and double till the end of file

import java.io.EOFException;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.ObjectInputStream;

public class ReadBinaryFile {

       public static void main(String[] args) {

            

             String inStr="";

             int countInt = 0, countDouble = 0;

             int sumInt = 0, minInt = 0, maxInt = 0, numInt;

             double sumDouble = 0 , minDouble = 0, maxDouble = 0, numDouble;

             ObjectInputStream myObjStream = null;

             FileInputStream fin = null;

             try {

                    fin = new FileInputStream("data.dat");

                    myObjStream = new ObjectInputStream(fin);

                    // loop to read the first 16 characters

                    for(int i=0;i<16;i++)

                           inStr += myObjStream.readChar();

                    // read an int and an double till the end of file

                    numInt = myObjStream.readInt();

                    countInt++;

                    sumInt += numInt;

                    if(countInt == 1)

                    {

                           minInt = numInt;

                           maxInt = numInt;

                    }else

                    {

                           if(maxInt < numInt)

                                 maxInt = numInt;

                           if(minInt > numInt)

                                 minInt = numInt;

                    }

                   

                    numDouble = myObjStream.readDouble();

                    countDouble++;

                    sumDouble += numDouble;

                    if(countDouble == 1)

                    {

                           minDouble = numDouble;

                           maxDouble = numDouble;

                    }else

                    {

                           if(maxDouble < numDouble)

                                 maxDouble = numDouble;

                           if(minDouble > numDouble)

                                 minDouble = numDouble;

                    }

                   

                   

             } catch (FileNotFoundException e) {

                   

                    System.out.println("File data.dat not found");

             }catch(EOFException e)

             {     

                   

                    try {

                           //     close the file

                           fin.close();

                           myObjStream.close();

                           // Display the results

                           System.out.println("Characters : "+inStr);

                           System.out.println("Total number of integers : "+countInt);

                           System.out.println("Total number of doubles : "+countDouble);

                           System.out.println("Sum of all integers : "+sumInt);

                           System.out.println("Sum of all doubles : "+sumDouble);

                           if(countInt > 0)

                           {

                                 System.out.println("Minimum Integer : "+minInt);

                                 System.out.println("Maximum Integer : "+maxInt);

                                 System.out.println("Average Integer : "+(sumInt/countInt));

                           }

                          

                           if(countDouble > 0)

                           {

                                 System.out.println("Minimum Double : "+minDouble);

                                 System.out.println("Maximum Double : "+maxDouble);

                                 System.out.println("Average Double : "+(sumDouble/countDouble));

                           }

                    } catch (IOException e1) {

                           System.out.println(e1.getMessage());

                    }

                   

                   

             }catch (IOException e) {

                   

                    System.out.println(e.getMessage());

             }

       }

}

//end of program