OJ Board

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

public class Scan_v3
{
	public static void main(String args[])throws FileNotFoundException
	{
		
	
			Scanner sc = new Scanner(new File(args[0]));
			
			while(sc.hasNextLong())
				{
					
						System.out.println(Math.abs(sc.nextLong()-sc.nextLong()));
				}
			sc.close();
		
	}
}

Main.java:5: class Scan_v2 is public, should be declared in a file named Scan_v2.java
public class Scan_v2
^
1 error

Scanner sc = new Scanner(new File(args[0]))

Input is terminated by End of File

Scanner sc = new Scanner(System.in)

java Main < input.txt

java Main input.txt

vickki wrote:Thanks MF this to help others well i also found out that scanning input

Code: Select all

Scanner sc = new Scanner(new File(args[0]))

is not the right way. I got confused by the line in Input section which states

Input is terminated by End of File

". Well for all other info if we do that we run into runtime error if compilation error is solved. well here we have to use

Code: Select all

Scanner sc = new Scanner(System.in)

instead of previous code. As the compiler in UVA works on redirection method of file. i.e.

java Main < input.txt

[/b] rather than

java Main input.txt

.