Write code to do Matrix Diagonals Sum - Java Data Structure

Java examples for Data Structure:Matrix

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Description

Write code to do Matrix Diagonals Sum

You can use the following code structure and fill in your logics. 

public class Main {
  public static void main(String args[]) throws Exception {
    int sumD1 = 0;
    int mRow = 5;
    int mCol = 5;
    int[][] Array = new int[mRow][mCol];
    for (int r = 0; r < Array.length; r++) {
      for (int c = 0; c < Array[r].length; c++) {
        Array[r][c] = r * c;

      }
    }
    // Matrix printing block
    for (int r = 0; r < Array.length; r++) {
      for (int c = 0; c < Array[r].length; c++) {
        System.out.print(Array[r][c] + " ");

      }
      System.out.println();
    }
    // End of Printing

    //your code here
    
  }
}

Solution

Demo Code

public class Main {
  public static void main(String args[]) throws Exception {
    int sumD1 = 0;
    int mRow = 5;
    int mCol = 5;
    int[][] Array = new int[mRow][mCol];
    for (int r = 0; r < Array.length; r++) {
      for (int c = 0; c < Array[r].length; c++) {
        Array[r][c] = r * c;/*from   w w  w  . j a v a  2 s  .  c o  m*/

      }
    }
    // Matrix printing block
    for (int r = 0; r < Array.length; r++) {
      for (int c = 0; c < Array[r].length; c++) {
        System.out.print(Array[r][c] + " ");

      }
      System.out.println();
    }
    // End of Printing

    // diagonal sum block
    for (int r = 0; r < Array.length; r++) {
      for (int c = 0; c < Array[r].length; c++) {
        if (r == c) {
          sumD1 += Array[r][c];
        }

      }
    }
    System.out.println("Sum Diagonal 1: " + sumD1);
    // end of d1 vlock

    // diagonal 2 block
    int count = 0;
    int sumD2 = 0;
    int temp;
    int r, c;
    for (r = 0, c = mCol - 1; r < Array.length && c >= 0; r++, c--) {
      // r=0 c=3-1=2 v=0,2
      // r=1 c=2-1=1 v=1,1
      // r=2 c=2-1=1 v=2,1
      sumD2 = sumD2 + Array[r][c];
    }
    System.out.println("Sum Diagonal 2: " + sumD2);

    if (sumD1 == sumD2) {
      System.out.print("Equal");
    }

    else if (sumD1 > sumD2) {
      System.out.print("diagonal 1: " + sumD1);
    } else
      System.out.print("Diagonal 2: " + sumD2);

  }
}

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