MatrixSum.java

/* Christopher Yonek
 CSC-164-651 - Mr. Ng
 2/20/20
 8.5 Sum of Two Matrices: This program asks the user to enter the size of the matrices, and to enter their elements
 it will out put Matrix C which is the sum of the two
 */
import java.util.Scanner;
public class MatrixSum {
 public static void main(String []args) {
 //Get n, for n x n matrix
 int nByn = GetMatrixSize();
 System.out.println("== Matrix A ==");
 //Elements for the first matrix
 Double[][] matrixA = GetMatrixElements(nByn);
 System.out.println("== Matrix B ==");
 //Elements for the second matrix
 Double[][] matrixB = GetMatrixElements(nByn);
 //Add A+B
 Double[][] matrixSum = AddMatrix(nByn,matrixA,matrixB);
 //Output to user
 PrintMatrixSum(matrixSum,nByn);
 }
 public static int GetMatrixSize(){
 //Asks the user to enter one of the dimensions of the matrix
 int matrixSize;
 System.out.println("Enter the size of your square matrix (i.e. 3, for 3 x 3)");
 Scanner userInput = new Scanner(System.in);
 matrixSize = userInput.nextInt();
 return matrixSize;
 }

 public static Double[][] GetMatrixElements(int size) {
 int matrixOneRow = size, matrixOneCol = size, rowI, colJ;
 Double matrixOne[][] = new Double[size][size];
 //Create scanner for input
 Scanner userInput = new Scanner(System.in);

 // Prompt user to enter the elements
 System.out.println("Enter " + size * size + " Array Elements: ");
 for (rowI = 0; rowI < matrixOneRow; rowI++) {
 for (colJ = 0; colJ < matrixOneCol; colJ++) {
 matrixOne[rowI][colJ] = userInput.nextDouble();
 }
 }
 return matrixOne;
 }

 public static Double[][] AddMatrix(int size, Double[][] a, Double[][] b){
 // Takes in 2 Arrays and Adds them up
 Double[][] matrixC = new Double[size][size];
 for(int row = 0; row < a.length; row++){
 for(int col = 0; col < a[row].length; col++){
 matrixC[row][col] = a[row][col] + b[row][col];
 }
 }
 return matrixC;
 }

 public static void PrintMatrixSum(Double[][] c, int size){
 // Outputs the Array sum to the user
 System.out.print("The Sum is :\n");
 for(int i=0; i < size; i++){
 for(int j=0; j < size; j++){
 System.out.print(c[i][j]+ " ");
 }
 System.out.println();
 }
 }
}