void buildMatrix(int **x , int m , int n )
{
x = new int*[m] ;
if (!x) {cout<<"Low memory";exit('0');}
for (int i=0 ; i<n ; i++)
{
x[i] = new int[n] ;
}
if (!x) {cout<<"Low memory";exit('0');}
for (int i=0 ; i<n ; i++ )
{
for (int j=0 ; j<m ; j++ )
{
cout<<"Enter x["<<i+1<<"][" <<j+1<<"]\n";
cin>>x[i][j] ;
}
}
for (int i=0 ; i<n ; i++ )
{
for (int j=0 ; j<m ; j++ )
{
cout<<x[i][j]<<'\t' ;
}
cout<<'\n' ;
}
}