Sum of Left Diagonal – SchoolCodeHub

Given a square matrix of custom size the task is to calculate and print sum of left diagonal.

Example: Consider a square matrix

6	4	7
3	2	8
5	6	9

Sum of left diagonal elements is 6+2+9 = 17.

The program should output only the sum of the left diagonal.

Java

import java.util.*;
public class SumLeftDiagonal
{
    public static void main(String args[])
    {
        int size=0,sum=0;
        Scanner sc=new Scanner(System.in);
        System.out.print("Enter size of matrix: ");
        size=sc.nextInt();
        int ar[][]=new int[size][size];
        System.out.println("Enter matrix elements:-");
        for(int i=0;i<size;i++)
        {
            for(int j=0;j<size;j++)
            {
                ar[i][j]=sc.nextInt();
            }
        }
        for(int i=0;i<size;i++)
        {
            for(int j=0;j<size;j++)
            {
                if(i==j)
                {
                    sum=sum+ar[i][j];
                }
            }
        }
        System.out.println("Sum of left diagonal is "+sum);
    }
}

Java

import java.util.*;
public class SumLeftDiagonal
{
    public static void main(String args[])
    {
        int size=0,sum=0;
        Scanner sc=new Scanner(System.in);
        System.out.print("Enter size of matrix: ");
        size=sc.nextInt();
        int ar[][]=new int[size][size];
        System.out.println("Enter matrix elements:-");
        for(int i=0;i<size;i++)
        {
            for(int j=0;j<size;j++)
            {
                ar[i][j]=sc.nextInt();
            }
        }
        for(int i=0;i<size;i++)
        {
            sum=sum+ar[i][i];
        }
        System.out.println("Sum of left diagonal is "+sum);
    }
}

Java