Print the corner elements and their sum in a 2-D matrix

Given a 2-D matrix. The task is to print its corner elements and the sum of the corner elements.

Examples: That 

Input:  2   7   5   5   5   8   2
        2   4   4   8   8   3   5
        6   9   3   4   5   4   3
        7   1   3   7   4   2   8
        6   9   6   5   6   8   9
        8   6   9   9   8   3   6
Output:  Corner elements: 2 8 2 6, Corner_Sum = 18

Input:    6   4   6   9
          2   6   1   8
          5   5   2   2
          4   4   1   3
Output:   Corner elements: 6 4 9 3, Corner_Sum = 22

Approach: The corner element’s index in a 2-D matrix are:



  • left top corner: arr[0][0]
  • right top corner: arr[0][m-1]
  • left bottom corner: arr[n-1][0]
  • right bottom corner: arr[n-1][m-1]

    • where ‘m’ is the number of columns and ‘n’ is the number of rows.

Below is the implementation of the above approach.

C++

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// C++ program to print the corner
// elements and their sum
#include <iostream>
using namespace std;
const int n = 3;
const int m = 3;
  
// function to print corner elements
// their sum
void printCornerElements(int arr[][m])
{
  
    // print the corner elements
    cout << "left top corner: " << arr[0][0];
    cout << "\nright top corner: " << arr[0][m - 1];
    cout << "\nleft bottom corner: " << arr[n - 1][0];
    cout << "\nright bottom corner: " << arr[n - 1][m - 1];
  
    // print the sum of corner elements
    cout << "\n\nCorner elements Sum = "
         << arr[0][0] + arr[0][m - 1]
                + arr[n - 1][0] + arr[n - 1][m - 1];
}
  
// Driver Code
int main()
{
  
    int arr[][3] = {
        { 1, 2, 4 },
        { 5, 6, 8 },
        { 8, 3, 1 }
    };
  
    // Function to print the corner
    // elements and their sum
    printCornerElements(arr);
}

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Java














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// Java program to print the  


// corner elements and their sum 


  


class GFG  


{ 


static final int n = 3; 


static final int m = 3; 


  


// function to print corner  


// elements their sum 


static void printCornerElements(int arr[][]) 


{ 


  


// print the corner elements 


System.out.println("left top corner: " +  


                             arr[0][0]); 


System.out.println("right top corner: " +  


                          arr[0][m - 1]); 


System.out.println("left bottom corner: " +  


                            arr[n - 1][0]); 


System.out.println("right bottom corner: " +  


                         arr[n - 1][m - 1]); 


  


// print the sum of corner elements 


System.out.print("\nCorner elements Sum = "); 


System.out.println(arr[0][0] + arr[0][m - 1] +  


                               arr[n - 1][0] + 


                               arr[n - 1][m - 1]); 


} 


  


// Driver Code 


public static void main(String args[]) 


{ 


    int arr[][] ={{1, 2, 4}, 


                  {5, 6, 8}, 


                  {8, 3, 1}}; 


  


    // Function to print the corner 


    // elements and their sum 


    printCornerElements(arr); 


} 


} 


  


// This code is contributed 


// by Ankita_Saini 



















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Python3














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# Python3 program to print the corner 


# elements and their sum 


  


# function to print the 


# corner element and their sum . 


def printCornerElement(arr) : 


      


    # no. of rows 


    n = len(arr) 


  


    # no. of columns 


    m = len(arr[0]) 


  


    # print the corner elements 


    print("left top corner :",arr[0][0]) 


    print("right top corner :",arr[0][m - 1]) 


    print("left bottom corner :",arr[n - 1][0]) 


    print("right bottom corner :",arr[n - 1][m - 1]) 


  


    # sum of corner elements 


    corner_sum = (arr[0][0] + arr[0][m - 1] + 


           arr[n - 1][0] + arr[n - 1][m - 1]) 


           


    print("\ncorner elements Sum :",corner_sum) 


      


  


# driver code 


if __name__ == "__main__" : 


  


    # 2d array  


    arr = [ 


        [1,2,4], 


        [5,6,8], 


        [8,3,1], 


        ] 


    # function calling 


    printCornerElement(arr) 



















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C#














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// C# program to print  


// the corner elements 


// and their sum 


using System; 


  


class GFG  


{ 


static int n = 3; 


static int m = 3; 


  


// function to print corner  


// elements their sum 


static void printCornerElements(int[,] arr) 


{ 


  


// print the corner elements 


Console.WriteLine("left top corner: " +  


                            arr[0, 0]); 


Console.WriteLine("right top corner: " +  


                         arr[0, m - 1]); 


Console.WriteLine("left bottom corner: " +  


                           arr[n - 1, 0]); 


Console.WriteLine("right bottom corner: " +  


                        arr[n - 1, m - 1]); 


  


// print the sum of corner elements 


Console.Write("\nCorner elements Sum = "); 


Console.Write(arr[0, 0] + arr[0, m - 1] +  


              arr[n - 1, 0] +  


              arr[n - 1, m - 1]); 


} 


  


// Driver Code 


public static void Main() 


{ 


    int[,] arr ={{1, 2, 4}, 


                 {5, 6, 8}, 


                 {8, 3, 1}}; 


  


    // Function to print the corner 


    // elements and their sum 


    printCornerElements(arr); 


} 


} 


  


// This code is contributed 


// by Akanksha Rai(Abby_akku) 



















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PHP














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<?php  


// PHP program to print the corner 


// elements and their sum 


$n = 3; 


$m = 3; 


  


// function to print corner  


// elements their sum 


function printCornerElements(&$arr) 


{ 


    global $n, $m; 


      


    // print the corner elements 


    echo "left top corner: " . 


                   $arr[0][0]; 


    echo "\nright top corner: " .  


                 $arr[0][$m - 1]; 


    echo "\nleft bottom corner: " . 


                   $arr[$n - 1][0]; 


    echo "\nright bottom corner: " . 


               $arr[$n - 1][$m - 1]; 


  


    // print the sum of corner elements 


    echo "\n\nCorner elements Sum = ". 


        ($arr[0][0] + $arr[0][$m - 1] +  


                      $arr[$n - 1][0] +  


                 $arr[$n - 1][$m - 1]); 


} 


  


// Driver Code 


$arr = array(array( 1, 2, 4 ), 


             array( 5, 6, 8 ), 


             array( 8, 3, 1 )); 


  


// Function to print the corner 


// elements and their sum 


printCornerElements($arr); 


  


// This code is contributed  


// by ChitraNayal 


?> 



















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Output:


left top corner: 1
right top corner: 4
left bottom corner: 8
right bottom corner: 1

Corner elements Sum = 14






          
          
          
          

            

    

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    Article Tags : 
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