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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