j1.java

import java.util.Scanner;
public class j1 {
        public static void main(String[] args) {
            Scanner in = new Scanner(System.in);
            boolean stat = true;
            int option;

            while(stat){
                System.out.println("Hello this is a simple matrix calculator \n "
                        + "To Create a new matrix problem enter 1 and to exit the calculator enter 2");
                option = in.nextInt();
                switch(option){
                    case 1:
                        stat = createProblem(option);
                        break;
                    case 2:
                        stat = false;
                        break;
                    default:
                        stat = false;
                        break;
                }
            }
            System.out.println("Calculator now terminated");
        }
        public static boolean createProblem(int i){
            Scanner in = new Scanner(System.in);
            boolean condition;
            int contStat;
            boolean statusC;
            int frows;
            int fcolumns;
            int srows;
            int scolumns;
            int[][] matrix1;
            int[][] matrix2;
            int[][] matrix1Values;
            int[][] matrix2Values;
            System.out.println("Enter number of rows in first matrix");
            frows = in.nextInt();
            String operator;
            System.out.println("Enter number of columns in first matrix");
            fcolumns = in.nextInt();
            System.out.println("Enter number of rows in second matrix");
            srows = in.nextInt();
            System.out.println("Enter number of columns in second matrix");
            scolumns = in.nextInt();
            matrix1 = createMatrix(frows, fcolumns);
            matrix2 = createMatrix(srows, scolumns);
            matrix1Values = setMatrixValues(matrix1,"First");
            matrix2Values = setMatrixValues(matrix2, "Second");
            statusC = true;
            while(statusC){
                System.out.println("Select matrix operation, \n type in + for addition, - for subtraction or * for multiplication:");
                operator = in.next();
                statusC = performOperation(operator, matrix1Values, matrix2Values);
            }
            System.out.println("Type 1 if you would like to continue using the calcultor,\n type 2 if you would like to exit");
            contStat = in.nextInt();
            switch(contStat){
                case 1:
                    condition = true;
                    break;
                case 2:
                    condition = false;
                    break;
                default:
                    condition = false;
                    break;
            }
            return condition;

        }
        public static boolean performOperation(String operator, int[][] matrix1, int[][] matrix2){
            Scanner in = new Scanner(System.in);
            int optSelected;
            boolean status = false;
            switch(operator){

                case "+":
                    addMatrices(matrix1, matrix2);
                    break;
                case "-":
                    subtractMatrices(matrix1, matrix2);
                    break;
                default:
                    System.out.println("Operator not valid");
                    break;
            }
            System.out.println("If you would like to perform additional operations on the two matrices used"+
                    " Type 1, or if you what to use a different pair of matrices to perform operations with type 2"+
                    "To exit type 3");
            optSelected = in.nextInt();
            switch(optSelected){
                case 1:
                    status = true;
                    break;
                case 2:
                    status = false;
                    break;
                case 3:
                    status = false;
                    break;
            }
                                   return status;
        }
        public static int[][] setMatrixValues(int[][] matrix, String label){
            Scanner in = new Scanner(System.in);
            int dataEntered;
            int rows = matrix.length;
            int columns = matrix[0].length;
            for(int i=0; i<rows; i++){
                for(int j=0; j< columns; j++){
                    System.out.println("Enter value of "+label+" matrix at row: "+i+" and column:"+j+" :");
                    dataEntered = in.nextInt();
                    matrix[i][j] = dataEntered;
                }
            }
            return matrix;
        }
        public static int[][] createMatrix(int numRows, int numColumns){
            int[][] matrix = new int[numRows][numColumns];
            return matrix;
        }

        public static void addMatrices(int[][] matrix1, int[][] matrix2){
            boolean status = checkIfValidAddSub(matrix1, matrix2);
            if(status == true){
                for(int i = 0; i < matrix1.length; i++){
                    for(int j = 0; j < matrix1[0].length; j++){
                        int charM1 = matrix1[i][j];
                        int charM2 = matrix2[i][j];
                        int resultant = charM1 + charM2;
                        System.out.print(resultant+" ");
                    }
                    System.out.print("\n");
                }
            }else{
                System.out.println("In order to add or subtract matrices they both must have the same number of rows \n and the same number of columns");
            }
        }
        public static void subtractMatrices(int[][] matrix1, int[][] matrix2) {
            boolean status = checkIfValidAddSub(matrix1, matrix2);
            if (status == true) {
                for (int i = 0; i < matrix1.length; i++) {
                    for (int j = 0; j < matrix1[0].length; j++) {
                        int charM1 = matrix1[i][j];
                        int charM2 = matrix2[i][j];
                        int resultant = charM1 - charM2;
                        System.out.print(resultant + " ");
                    }
                    System.out.print("\n");
                }
            } else {
                System.out.println("In order to add or subtract matrices they both must have the same number of rows \n and the same number of columns");
            }
        }

        public static boolean checkIfValidAddSub(int[][] matrix1, int[][] matrix2){
            boolean status;
            int numRows1 = matrix1.length;
            int numColumns1 = matrix1[0].length;
            int numRows2 = matrix2.length;
            int numColumns2 = matrix2[0].length;
            if(numRows1 == numRows2 && numColumns1 == numColumns2){
                status = true;
            }else{
                status = false;
            }
            return status;
        }
        public static boolean checkIfValidMult(int[][] matrix1, int[][] matrix2){
            boolean status;
            int columns = matrix1[0].length;
            int rows = matrix2.length;
            if( columns == rows){
                status = true;
            }else{
                status = false;
            }
            return status;
        }

    }
{
 public static boolean checkIfValidMult(int[][] matrix1, int[][] matrix2){
            boolean status;
            int columns = matrix1[0].length;
            int rows = matrix2.length;
            if( columns == rows){
                status = true;
            }else{
                status = false;
            }
            return status;
        }

}