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Monday, February 1, 2010

Write a program to find the sum of squares of elements on the diagonal of a square matrix nxn


#include<iostream.h>
#include<conio.h>


# define n 10


void main( )
{
int mat[n][n];


int d;
long  left_diag = 0, right_diag = 0;


// Input elements
cout<<  "\n  Enter dimension of square matrix:";
cin >> d;


for(int i = 0; i < d ; i++)
for( int j = 0; j < d ; j++)
{cout<<"\n Enter elements for "<<  i+1 << "," << j+1 <"location :";
cin >> mat[i][j];
}


clrscr();


//Print the array
for( i = 0; i < d ; i++)


{for( j = 0; j < d ; j++)
   cout<<  mat[i][j]<<"\t";
cout<< "\n";
}


//left diagonal ----


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


 for( j = 0; j < d ; j++)
      if(i= = j)
         left_diag += mat[i][j] * mat [i][j];


//right diagonal ----


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


for( j = 0; j < d ; j++)
   if((i+j) = = (d - 1))
      right_diag += mat[i][j] * mat [i][j];


cout<< "\n Sum of the squares of left diagonal elements = " << left_diag;


cout<< "\n Sum of the squares of right diagonal elements = " <<  right _diag;




getch ( );


}

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