map<string,int> m; m["xiaoming"] =80; m["xiaogang"] =90; m["xiaoqing"] =100; cout <<"xiaoqing's score: "<< m.at("xiaoqing") << endl;// 输出100cout <<"xiaoqiang's score"<< m.at("xiaoqiang") << endl;// 抛出异常:out_of_range exception}catch(std::exception& e) { cou...