converting feet to metres with decimal points

Next, calculcate meters...

meters = feet / 3.28

float meters;

void loop( void )
{
...
  meters = feet / 3.28;
...
}

Because meters depends on feet (which depends on count) the expressions have to be performed in order...

void loop( void )
{
...
  // Update count when the button is pressed
  feet = count / 10.0;
  meters = feet / 3.28;
...
}