inputData.txt file -15 -57 -75 -93 -42 -1 -9 -63 -77 -12 Problem Statement: The

Question

inputData.txt file

-15
-57
-75
-93
-42
-1
-9
-63
-77
-12

Problem Statement: The following method does not appear to be working properly if all data are negative numbers You are asked to write a test driver class that will test this method in order to identify the issue with the code. The driver class will first read a data (from an input file called "inputData.txt") into an integer array then call the method with different input parameters to test its functionality. Finds the target value in array elements x[start] through x[last]. @param x array whose largest value is found @param start first subscript in range @param last last subscript in range @return the largest value of x start] through x[last] apre first last public int findMax(int[] x, int start, int last) f if (start last throw new IllegalArgumentException("Empty range"); int maxSoFar 0; for (int i start i last i++) if (x[i] maxSoFar) maxSoFar i; return maxSoFar;

Explanation / Answer

inputData.txt (save the file under D drive .Then the path of the file pointing to it is D:\inputData.txt)

-15
-57
-75
-93
-42
-1
-9
-63
-77
-12
______________________

ReadFileNos.java

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class ReadFileNos {
public static void main(String[] args) {
   //Creating an integer type two dimensional array of size 10
   int arr[]=new int[10];
  
   //Declaring variables
   int i=0,start = 0,last=0,max=0;
   Scanner ifsInput =null;
  
try {

       //Scanner object is used to get the inputs entered by the user
   ifsInput=new Scanner(System.in);
  
   //getting the inputs enetred by the user
   System.out.print("Enter the start value :");
start=ifsInput.nextInt();
System.out.print("Enter the last value :");
last=ifsInput.nextInt();
  
//Opening the file
ifsInput = new Scanner(new File("D:\inputData.txt"));

  
//reading the data from the file
while(ifsInput.hasNextInt())
{
arr[i]=ifsInput.nextInt();
i++;
}
  
max=findMax(arr,start,last);
} catch (FileNotFoundException e) {
//Displaying the exception
System.out.println(e);
}
finally
{
   ifsInput.close();
}
System.out.println("The maximum number between "+start+" and "+last+" elements of an array is "+max);
  
}

//this method will find the maximum value with in the range
   private static int findMax(int[] arr, int start, int last) {
       if(start>last)
           throw new IllegalArgumentException("Empty range");
       int maxSoFar=arr[0];
       for(int i=start;i<last;i++)
       {
           if(arr[i]>maxSoFar)
               maxSoFar=arr[i];
       }
       return maxSoFar;
   }
}

_____________________

Output#1:

Enter the start value :1
Enter the last value :7
The maximum number between 1 and 7 elements of an array is -1

__________________

Output#2:

Enter the start value :8
Enter the last value :10
The maximum number between 8 and 10 elements of an array is -12

__________________

Output#3:

Enter the start value :1
Enter the last value :5
The maximum number between 1 and 5 elements of an array is -15

___________________Thank You

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