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Kotlin program to add two matrices

Kotlin | Two matrices addition: Here, we are going to learn how to add two given matrices using multi-dimensional array in Kotlin programming language? Submitted by IncludeHelp, on May 06, 2020

Kotlin - Add two matrices

Given two matrices, we have to add them.

Example:

Input:
matrix 1:
[2, 3]
[4, 5]
[7, 1]

matrix 2:
[4, 6]
[9, 0]
[7, 6]

Output:
[6, 9]
[13, 5]
[14, 7]    

Program to add two matrices in Kotlin

package com.includehelp

import java.util.*

// Main function, Entry Point of Program
fun main(args: Array<String>) {
    //variable of rows and col
    val rows: Int
    val column: Int

    //Input Stream
    val scanner = Scanner(System.`in`)

    //Input no of rows and column
    print("Enter the number of rows and columns of matrix : ")
    rows   = scanner.nextInt()
    column = scanner.nextInt()

    //Create Array
    val matrixA     = Array(rows) { IntArray(column) }
    val matrixB     = Array(rows) { IntArray(column) }
    val matrixSum   = Array(rows) { IntArray(column) }


    //Input Matrix
    println("Enter the Elements of First Matrix ($rows X $column} ): ")
    for(i in matrixA.indices){
        for(j in matrixA[i].indices){
            print("matrixA[$i][$j]: ")
            matrixA[i][j]=scanner.nextInt()
        }
    }

    //Input Matrix
    println("Enter the Elements of Second Matrix ($rows X $column} ): ")
    for(i in matrixB.indices){
        for(j in matrixB[i].indices){
            print("matrixB[$i][$j]: ")
            matrixB[i][j]=scanner.nextInt()
        }
    }

    //print Matrix A
    println("Matrix A : ")
    for(i in matrixA.indices){
        println("${matrixA[i].contentToString()} ")
    }

    //print Matrix B
    println("Matrix B : ")
    for(i in matrixB.indices){
        println("${matrixB[i].contentToString()} ")
    }

    //Perform Addition
    for(i in matrixSum.indices){
        for(j in matrixSum[i].indices){
            matrixSum[i][j]=matrixA[i][j]+matrixB[i][j]
        }
    }

    //Print Sum of Matrices
    println("Sum of the Matrices:")
    for(i in matrixSum.indices){
        println("${matrixSum[i].contentToString()} ")
    }
}

Output

Run 1:
Enter the number of rows and columns of matrix : 3
2
Enter the Elements of First Matrix (3 X 2} ):
matrixA[0][0]: 2
matrixA[0][1]: 3
matrixA[1][0]: 4
matrixA[1][1]: 5
matrixA[2][0]: 7
matrixA[2][1]: 1
Enter the Elements of Second Matrix (3 X 2} ):
matrixB[0][0]: 4
matrixB[0][1]: 6
matrixB[1][0]: 9
matrixB[1][1]: 0
matrixB[2][0]: 7
matrixB[2][1]: 6
Matrix A :
[2, 3]
[4, 5]
[7, 1]
Matrix B :
[4, 6]
[9, 0]
[7, 6]
Sum of the Matrices:
[6, 9]
[13, 5]
[14, 7]
---------------
Run 2:
Enter the number of rows and columns of matrix : 3
3
Enter the Elements of First Matrix (3 X 3} ):
matrixA[0][0]: 2
matrixA[0][1]: 3
matrixA[0][2]: 4
matrixA[1][0]: 5
matrixA[1][1]: 6
matrixA[1][2]: 7
matrixA[2][0]: 0
matrixA[2][1]: 9
matrixA[2][2]: -7
Enter the Elements of Second Matrix (3 X 3} ):
matrixB[0][0]: 4
matrixB[0][1]: 0
matrixB[0][2]: -6
matrixB[1][0]: -3
matrixB[1][1]: 2
matrixB[1][2]: 3
matrixB[2][0]: 4
matrixB[2][1]: 5
matrixB[2][2]: 6
Matrix A :
[2, 3, 4]
[5, 6, 7]
[0, 9, -7]
Matrix B :
[4, 0, -6]
[-3, 2, 3]
[4, 5, 6]
Sum of the Matrices:
[6, 3, -2]
[2, 8, 10]
[4, 14, -1]