int x;

// ok, done with it
// how do I destroy var. x manually?
// then reuse name

float x;

How do I destroy variables manually and use same var. name in same scope?

My actual situation look more like this:

std::ofstream output;

// do stuff

output.close();

// at this point I need to open same output file
// but I want to read/write this time

std::fstream output;  // is this even good code? I should destroy previous object first