com.c

   | exp IF exp ELSE exp {
        if ($3.expression_type == IMMEDIATE){
            if ($3.value) {
                $$ = $1;            
            } else {
                $$ = $5;            
            }
        } else {
            t_axe_label* exit = newLabel(program);
            t_axe_label* else_branch = newLabel(program);
            gen_andb_instruction(program, $3.value, $3.value, $3.value, CG_DIRECT_ALL);
            gen_beq_instruction(program, else_branch, 0);
            $$ = $1;
            gen_bt_instruction(program, exit, 0);
            assignLabel(program, else_branch);
            $$ = $5;
            assignLabel(program, exit);
        }
    }

example.c

int b;
int a = 33;
int c = 44;

b = 3 if a > 0 else 0;

write(b);