package com.journaldev.examples;
import java.util.Scanner;
public class MatrixPrograms {
public static void main(String[] args) {
System.out.println("Please enter the rows in the matrix");
Scanner sc = new Scanner(System.in);
int row = sc.nextInt();
System.out.println("Please enter the columns in the matrix");
int column = sc.nextInt();
int[][] first = new int[row][column];
int[][] second = new int[row][column];
for (int r = 0; r < row; r++) {
for (int c = 0; c < column; c++) {
System.out.println(String.format("Enter first[%d][%d] integer", r, c));
first[r][c] = sc.nextInt();
}
}
for (int r = 0; r < row; r++) {
for (int c = 0; c < column; c++) {
System.out.println(String.format("Enter second[%d][%d] integer", r, c));
second[r][c] = sc.nextInt();
}
}
// close the scanner
sc.close();
// print both matrices
System.out.println("First Matrix:\n");
print2dArray(first);
System.out.println("Second Matrix:\n");
print2dArray(second);
// sum of matrices
sum(first, second);
}
// below code doesn't take care of exceptions
private static void sum(int[][] first, int[][] second) {
int row = first.length;
int column = first[0].length;
int[][] sum = new int[row][column];
for (int r = 0; r < row; r++) {
for (int c = 0; c < column; c++) {
sum[r][c] = first[r][c] + second[r][c];
}
}
System.out.println("\nSum of Matrices:\n");
print2dArray(sum);
}
private static void print2dArray(int[][] matrix) {
for (int r = 0; r < matrix.length; r++) {
for (int c = 0; c < matrix[0].length; c++) {
System.out.print(matrix[r][c] + "\t");
}
System.out.println();
}
}
}
private static void subtract(int[][] first, int[][] second) {
int row = first.length;
int column = first[0].length;
int[][] sum = new int[row][column];
for (int r = 0; r < row; r++) {
for (int c = 0; c < column; c++) {
sum[r][c] = first[r][c] - second[r][c];
}
}
System.out.println("\nSubtraction of Matrices:\n");
print2dArray(sum);
}
private static void multiply(int[][] first, int[][] second) {
int row = first.length;
int column = first[0].length;
int[][] sum = new int[row][column];
for (int r = 0; r < row; r++) {
for (int c = 0; c < column; c++) {
sum[r][c] = first[r][c] * second[r][c];
}
}
System.out.println("\nMultiplication of Matrices:\n");
print2dArray(sum);
}