$```$

main$()$

$\{$

static const float real;

char

real $=99\mathrm{.}9$;

code $=\text{'}$A$\text{'}$;

if $($code $!=\text{'}$A$\text{'})$

real $=0\mathrm{.}0$; $/*$ set to zero $*/$

else

real $=99\mathrm{.}9$; $/*$ reset to initial value $*/$

$\}$

$```$