# how to write program in cpp find the sum of either of the diagonals of a 4 x 4 matrix

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#include <iostream.h> #include <conio.h> void main() { clrscr(); int x; int A[4][4],sum=0; //Reading the matrix. cout << “Enter the elements of the matrix : ” << endl; for(int y=0;y<4;y++) for (int x=0;x<4;x++) { cout << “Element ” << x+1 << “, ” << y+1 << ” : “; cin>>A[x][y]; } //Sum of either of the diagonal elements. for(x=0;x<4;x++) for(y=0;y<4;y++) if(x==y) sum+=A[x][y]; else if(y==4-(1+1)); sum+=A[x][y]; cout << “Sum of either of the diagonal elements is : ” << sum; getch(); }

This program takes in the elements A[x][y] of the 4 x 4 matrix as a screen input from the

user.

It then calculates the sum of either of its diagonals and outputs it using the ‘cout’

command.

**INPUT** :

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

**OUTPUT** :

Sum of either of the diagonal elements is : 34

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