JAVA PROGRAMS: TO ENTER A MATRIX OF nXn AND PRINT ITS DIAGONALS AS WELL AS THEIR SUM SEPARATELY

TO ENTER A MATRIX OF nXn AND PRINT ITS DIAGONALS AS WELL AS THEIR SUM SEPARATELY

ALGORITHM

Step-1 Start

Step-2 Initialization of variables.

Step-3 Accept the limit value for no. of rows and columns.

Step-4 Declaration of a 2-D array with ‘limit’ as its both subscripts.

Step-5 Run the loop for no. of rows.

Step-6 Run the loop for no. of columns.

Step-7 Store the numbers in the declared array.

Step-8 Change the line.

Step-9 Run the loop for no. of rows.

Step-10 Run the loop for no. of columns.

Step-11 If no. of rows are equal to no. of columns then print the left diagonal and add the value of the left diagonal to a counter variable else, proceed to Step-12.

Step-12 If no. of rows + no. of columns is equal to subscript limit -1 then print the right diagonal and add the value of the right diagonal to a counter variable else, proceed to Step-13.

Step-13 Print horizontal tab (i.e. ‘\t’)

Step-14 Display the sum of both diagonals separately.

Step-15 Exit

PROGRAM

import java.io.*;

class diagonal

{

public static void main()throws IOException

{

BufferedReader br=new BufferedReader(new InputStreamReader (System.in));

System.out.println("Enter No. of rows and columns");

int n=Integer.parseInt(br.readLine());

int a[][]=new int[n][n];

int i,j,ld=0,rd=0;

for (i=0;i<n;i++)

{

for (j=0;j<n;j++)

{

System.out.println("Enter a number");

a[i][j]=Integer.parseInt(br.readLine());

}

for (i=0;i<n;i++)

{

for (j=0;j<n;j++)

{

System.out.print(a[i][j]+"\t");

}

System.out.println();

}

System.out.println ("Diagonals are as follows");

for (i=0;i<n;i++)

{

for (j=0;j<n;j++)

{

if (i==j)

{

ld=ld+a[i][j];

System.out.print(a[i][j]+"\t");

}

else if (i+j==n-1)

{

System.out.print(a[i][j]+"\t");

rd=rd+a[i][j];

}

else

{

System.out.print("\t");

}

System.out.println();

}

System.out.println("Sum of Left Diagonal is "+ld);

System.out.println("Sum of Right Diagonal is "+rd);

}

VARIABLE DESCRIPTION-

VARIABLE USED	DATATYPE	DESCRIPTION
n	Integer type	For storing the value for no. of rows and columns.
a	Integer type	A 2-D array with variable ‘n’ as subscripts.
i	Integer type	For running the loop for no. of rows.
j	Integer type	For running the loop for no. of columns.
ld	Integer type	For storing the sum of the left diagonal.
rd	Integer type	For storing the sum of the right diagonal.