How to return?

1-One.cpp

function()
{
  if(statement)
    return value_one;
  else
    return value_two;
}

2-Two.cpp

function()
{
  if(statement)
    return value_one;

  return value_two;
}

3-Three.cpp

function()
{
  return_value = value_two;
  
  if(statement)
    return_value = value_one;

  return return_value;
}

4-Four.cpp

function()
{
  return statement ? value_one : value_two;
}