Java program to add, subtract and multiply 2 dimensional array
The blog provides the technical solution for w dimensional arrays in java. 2 dimensional arrays are the most important java array topic in interviews for java developers. Java Array questions like ” how to find multiplication of two matrix in java arrays” , ” java program to add / multiply two array matrix and shows the addition in another dimensional array” , “what could be the result when two array matrix are subtracted”
Problem Statement:
How to add , subtract or multiply Two 2-dimensional arrays in java ?
Solution Approach:
- Ask user to enter the matrices count ( 2-dimemsional array as Input)
- Get the Array elements (rows and columns) as User Input
- Initialize the arrays with received count
int n; // array size //Scanner Object to read user input Scanner scan = new Scanner(System.in); n = scan.nextInt(); //create 2 dimensional array (matrix) objects int[][] TwoDimensionalInputArray_1 = new int[n][n]; int[][] TwoDimensionalInputArray_2 = new int[n][n]; int[][] TwoDimensionalResultArray_3 = new int[n][n];
- Read the Array elements and set the values in the 2-dimensional array for 1st Array Matrix
for (int incr = 0; incr < n; incr++)
{
for (int innerIncr = 0; innerIncr < n; innerIncr++)
{
TwoDimensionalInputArray_1[incr][innerIncr] = scan.nextInt();
}
}- Read the Array elements and set the values in the 2-dimensional array for 1st Array Matrix
for (int incr = 0; incr < n; incr++)
{
for (int innerIncr = 0; innerIncr < n; innerIncr++)
{
TwoDimensionalInputArray_2[incr][innerIncr] = scan.nextInt();
}
}for (int i = 0; i < n; i++) // Iterate elements of 1st Input Array
{
for (int j = 0; j < n; j++) // Iterate elements of 2nd Input Array
{
for (int k = 0; k < n; k++) // // Iterate elements of Result Array
{
TwoDimensionalResultArray_3[i][j] =
TwoDimensionalResultArray_3[i][j] +
TwoDimensionalInputArray_1[i][k] *
TwoDimensionalInputArray_2[k][j];
}
}
}for (int i = 0; i < n; i++) // Iterate elements of 1st Input Array
{
for (int j = 0; j < n; j++) // Iterate elements of 2nd Input Array
{
for (int k = 0; k < n; k++) // // Iterate elements of Result Array
{
TwoDimensionalResultArray_3[i][j] =
TwoDimensionalInputArray_1[i][k] +
TwoDimensionalInputArray_2[k][j];
}
}
}for (int i = 0; i < n; i++) // Iterate elements of 1st Input Array
{
for (int j = 0; j < n; j++) // Iterate elements of 2nd Input Array
{
for (int k = 0; k < n; k++) // // Iterate elements of Result Array
{
TwoDimensionalResultArray_3[i][j] =
TwoDimensionalInputArray_1[i][k] -
TwoDimensionalInputArray_2[k][j];
}
}
}package com.java.planforexams.array;
import java.util.Scanner;
public class TwoDimensionalArrayMultiply {
public static void main(String args[])
{
int n;
//Scanner Object to read user input
Scanner scan = new Scanner(System.in);
//Get Array Input for Rows and Columns
System.out.print("Enter matrix count : ");
n = scan.nextInt();
//create 2 dimensional array (matrix) objects
int[][] TwoDimensionalInputArray_1 = new int[n][n];
int[][] TwoDimensionalInputArray_2 = new int[n][n];
int[][] TwoDimensionalResultArray_3 = new int[n][n];
//input 1st Matrix
System.out.println("Enter elements of 1st Matrix row and cols \n");
for (int incr = 0; incr < n; incr++)
{
for (int innerIncr = 0; innerIncr < n; innerIncr++)
{
TwoDimensionalInputArray_1[incr][innerIncr] = scan.nextInt();
}
}
// input 2nd Matrix
System.out.println("Enter elements of 2nd mrtix row and cols \n");
for (int incr = 0; incr < n; incr++)
{
for (int innerIncr = 0; innerIncr < n; innerIncr++)
{
TwoDimensionalInputArray_2[incr][innerIncr] = scan.nextInt();
}
}
// Iterate the Array elements for Multiplying Array 1 * Array 2
System.out.println("Multiplying 2 dimensional arrays...");
for (int i = 0; i < n; i++) //Iterate elements of 1st Input Array
{
for (int j = 0; j < n; j++) //Iterate elements of 2nd Input Array
{
for (int k = 0; k < n; k++) //Iterate elements of Result Array
{
TwoDimensionalResultArray_3[i][j] =
TwoDimensionalResultArray_3[i][j] +
TwoDimensionalInputArray_1[i][k] *
TwoDimensionalInputArray_2[k][j];
}
}
}
// Print the Result of 2 -Dimensional arrays
System.out.println("Result of multiplying 2 dimensional arrays : ");
for (int outerIncr = 0; outerIncr < n; outerIncr++)
{
for (int innerIncr = 0; innerIncr < n; innerIncr++)
{
System.out.println(TwoDimensionalResultArray_3[outerIncr]
[innerIncr] + " ");
}
}
scan.close();
}
}
Output:
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