Question

Can I declare two variables in a conditional in C++. The compiler gave an error but still I think I should get an opinion:

int main()
{
    double d1 = 0;
    if((double d2 = d1) || (double d3 = 10))
        cout << "wow" << endl;
    return 0;
}

Answer 1

You can only do that for one variable

if(double d2 = d1)
    cout << "wow" << endl;
else 
if(double d3 = 10)
    cout << "wow" << endl;

But i would declare them outside of the conditions. If you are scared about the scope, you can always limit it:

{
  double d2 = d1;
  double d3 = 10;
  if(d2 || d3)
    cout << "wow" << endl;
}

Of course, this evaluates the second initializer even if d2 evaluates to true. But i assume that’s not important.