$1)$ @Override

public Instruction visitIntValue$($IntValue intValue, Void $\_\_)\{$

$//$ TODO implement $($task $3\mathrm{.}1)$

throw new UnsupportedOperationException$()$;

$\}2)$ class CodeGenerator $\{$

$//$ Exercise $3\mathrm{.}1$: Arithmetic

method visitIntValue$($value: int$)\{$

$//$ Generate code for integer values

$\}$ write the $2.$ code into $1.$ code