// file: tr_tr_level_0.cc//// isip include files//#include "train_trace.h"#include "train_trace_constants.h"// method: set_level_cc//// arguments://  int_4 inst: (input) the level to be set//// return: a logical_1 indicating status//// this method sets the level//logical_1 Train_Trace::set_level_cc(int_4 inst_a) {  // set the level inst  //  level_d = inst_a;  // exit gracefully  //  return ISIP_TRUE;}