I have the following code, which has a matrix defined by the system input: import java.io.*;
import java.util.*;

public class Test {

public static void main(String[] args) {

S

You are watching: Barcode scanner input or output

I have the following code, in which a matrix is ​​defined by the system input:Scanner object expecting input

import java.io.*;
import java.util.*;

public class Test {

    public static void main(String[] args) {

     Scanner in = new Scanner(System.in);

     //define size of matrix
     int size = in.nextInt();

     int primeSum = 0;
     int secSum = 0;
     int[] matrix = new int[size*size];

     //create matrix
     for (int i=0; i<size*size;i++) {
      matrix[i] = in.nextInt();
     }

     in.close();

     //sum primary diagonal
     for (int i=0; i < size*size;i += (size + 1)) {
      primeSum = primeSum + matrix[i];
     }

////sum secondary diagonal
// for (int i=(size - 1); i < size*size; i += (size - 2)) {
// secSum = secSum + matrix[i];
// }

     System.out.println(Math.abs(secSum - primeSum));


    }
}

The code above works that it allows the user to define an NxN matrix by entering N as size - so in case size = 2 the user would define 4 matrix elements. However, after coming back in the code for the secondary diagonal, the scanner object expects input beyond 4 integers - I have no idea why this would affect the program if I close the input stream before that block of code is reached.


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