Question

Get doubles from input file. Output the biggest. Answer the comments throughout the code.

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class Lab8Num1 {
public static void main(String[] args) {
//Declaring variable to be used for storing and for output
double biggest,temp;
//Creating file to read numbers
File inFile = new File("lab8.txt");
//Stream to read data from file
Scanner fileInput = null;
try {
fileInput = new Scanner(inFile);
} catch (FileNotFoundException ex) {
//Logger.getLogger(Lab10.class.getName()).log(Level.SEVERE, null, ex);
}
//get first number and make it the biggest;
biggest=fileInput.nextDouble();
//loop through the file
while(fileInput.hasNextLine())
{
//getting doubles and comparing with current "biggest"
temp=fileInput.nextDouble();
if(temp>biggest)
biggest=temp;
}
System.out.println("The biggest number was " + biggest);
}
}

Answer 1

Solution:

The code provided in question is conceptually correct. Also the syntax seems correct. I have added better comments to help you understand the code properly.

also you might be making some errors while executing it. errors might be as follows

1. wrong syntax for execution.
2. file name not matching or location of added file name is not correct. (input file in code)

i have added the correct syntax for execution in my output screenshot, please go through that.

Also, it will help, if you store lab8.txt file in the same location as your program

code with changed comments

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

import java.io.File;

import java.io.FileNotFoundException;

import java.util.Scanner;

class Lab8Num1 {

public static void main(String[] args) {

double biggest,temp; //variables that we are using to

File inFile = new File("lab8.txt"); //we are creating a file object from file class which will read our file

Scanner fileInput = null;

/*this is a try catch block to handle exception i.e if you dont find the file this will raise

an exception */

try {

fileInput = new Scanner(inFile);

} catch (FileNotFoundException ex) {

}

// we are getting a stream of values from our file

biggest=fileInput.nextDouble(); // the first number that we get from our file has been initializes biggest.

//loop through the file

// this while loop will find the biggest number

while(fileInput.hasNextLine())

{

// the incoming numbers from files are stores in temp variable

temp=fileInput.nextDouble();

if(temp>biggest)// we are checking if the value of temp is larger than biggest.

biggest=temp;//if the above statement is true we are updating the value of biggest with temp

}

System.out.println("The biggest number was " + biggest); // print out the biggest number.

}

}

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

code screenshots:

Output Screenshot:

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