float diagonalSum(float MATRIX[6][6], int r, int c)
{
int i,j;
float sum=0;
//We are calculating sum of diagonal elements considering both diagonals
//We are adding intersecting element on two diagonal twice
for(i=0;i<r;i++)
{
for(j=0;j<c;j++)
{
if(i==j) //elements on first diagonal
sum+= MATRIX [i][j];
if((i+j)==(r-1)) // elements on off-diagonal
sum+= MATRIX [i][j];
}
}
return sum;
}