Write a c++ program to find sum of diagonal elements of a square matrix

Write a c++ program to find sum of diagonal elements of a square matrix

 

//

//  main.cpp

//  SumOfDiagonal

//

//  Created by SHIVAM SINGH on 23/07/22.

//

#include <iostream>

using namespace std;

class sqr_mat

{

    int arr[5][5];

    public :

        void input( );

        int diag_sum( );

        void display( );

};

void sqr_mat :: input()

{

    int i,j;

    for (i = 0 ; i < 5 ; i++ ) {

        for (j = 0 ; j < 5 ; j++ ) {

            cout<<“Input a number : “<<endl;

            cin>>arr[i][j];

        }

    }

}

void sqr_mat :: display()

{

    for (int i = 0 ; i < 5 ; i++ ) {

        for (int j = 0 ; j < 5 ; j++ ) {

            cout<<arr[i][j]<<” “;

        }

        cout<<endl;

    }

}

int sqr_mat :: diag_sum()

{

    int i,j,sum=0,t=4;

    for (i = 0 ; i < 5 ; i++ ) {

        for (j = 0 ; j < 5 ; j++ ) {

            if ( i == j ) {

                sum = sum + arr[i][j];

            }

        }

        sum = sum + arr[i][t];

        t–;

    }

    sum = sum – arr[2][2];

    return sum;

}

int main()

{

    sqr_mat obj;

    obj.input();

    obj.display();

    

    cout<<“Sum of Diagonal is : “<< obj.diag_sum()<<endl;

    

    return 0;

}

 

 

 

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