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;
...
}