code: def add_var_declaration(self, size):
      var_name = self.get_var_name()
      self.add_code_line(
          self.tpl_var_declaration(
              var_type=self._get_var_declare_type(size > 1),
              var_name=var_name,
              init_val="@(0.0)" if size > 1 else "0.0",
          )
      )
      return var_name
  
file_path: m2cgen/m2cgen/interpreters/powershell/code_generator.py
imports: from contextlib import contextmanager
  from m2cgen.ast import CompOpType
  from m2cgen.interpreters.code_generator import CLikeCodeGenerator, CodeTemplate
label_desc: Use image node_id 6 for calling the PowershellCodeGenerator obj's underlying member method code with example usage: obj.add_var_declaration(size) and returns: var_name