 # Matrix Problem in Java

## Question

Write a program to read three integers N, L, U from the input filename “input8.txt”. Note that the input file may contain comments before the actual numbers N, L and U. Assumed that L < U. Create a matrix of size N by N filled with random integers in the range [L, U]. Imagine that in this square matrix we will have 2 diagonals as follow
1
2
3
43

Write the following methods to
+ Symmetrically swap number in regions 1 and 2
+ Symmetrically swap number in regions 2 and 3
Output the resulted matrix to files “output8_01.txt” and “output8_02.txt”

Example
input8.txt
// This is the comment, your program should skip this line
// and also this line
4 5 30
Original matrix is
5 6 7 8
10 11 12 13
15 16 17 18
20 21 22 23
output8_01.txt
5 10 15 20
6 11 16 21
7 12 17 22
8 13 18 23
output8_02.txt
23 18 13 8
22 17 12 7
21 16 11 6
20 15 10 5

## Solution Preview

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import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.util.InputMismatchException;
import java.util.Scanner;

public class Solution {

public static void main(String[] args) throws FileNotFoundException, UnsupportedEncodingException
{
Scanner fileIn = new Scanner(new File("input8.txt"));
PrintWriter writer1 = new PrintWriter("output8_01.txt", "UTF-8");
PrintWriter writer2 = new PrintWriter("output8_02.txt", "UTF-8");
int N, L, U;
String line;
int[][] matrix, matrix1, matrix2;
while(true)
{
try
{
N = fileIn.nextInt();
break;
}catch(InputMismatchException e){
fileIn.next();
continue;
}
}
L = fileIn.nextInt();
U = fileIn.nextInt();

matrix = new int[N][N];
for(int i = 0; i < N; i++)
for(int j = 0; j < N; j++)
matrix[i][j] = (int)(Math.random() * (L-U) + U);

System.out.println("Original matrix is: ");
for(int i = 0; i < N; i++)
{
for(int j = 0; j < N; j++)
System.out.print(matrix[i][j] + " ");
System.out.println();
}
matrix1 = matrixMod1(matrix);
System.out.println("First modified matrix is: ");
for(int i = 0; i < N; i++)
{...
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