C++ 学生成绩管理系统：输入、查询、修改、存储

///'#include //n#include //n#include //n//nusing namespace std;//n//nstruct Student {//n string name;//n float score;//n};//n//nmap<string, Student> students;//n//nvoid inputData() {//n string id, name;//n float score;//n //n cout << ///'请输入学生学号：///';//n cin >> id;//n //n if (students.find(id) != students.end()) {//n cout << ///'学号已存在！///' << endl;//n return;//n }//n //n cout << ///'请输入学生姓名：///';//n cin >> name;//n //n cout << ///'请输入学生成绩：///';//n cin >> score;//n //n Student student;//n student.name = name;//n student.score = score;//n //n students[id] = student;//n //n cout << ///'学生信息已保存！///' << endl;//n}//n//nvoid queryScore() {//n int choice;//n string input;//n //n cout << ///'请选择查询方式（1-按学号查询，2-按姓名查询）：///';//n cin >> choice;//n //n if (choice == 1) {//n cout << ///'请输入学生学号：///';//n cin >> input;//n //n if (students.find(input) != students.end()) {//n Student student = students[input];//n cout << ///'学号：///' << input << ///' 姓名：///' << student.name << ///' 成绩：///' << student.score << endl;//n } else {//n cout << ///'未找到该学生！///' << endl;//n }//n } else if (choice == 2) {//n cout << ///'请输入学生姓名：///';//n cin >> input;//n //n bool found = false;//n for (const auto& pair : students) {//n if (pair.second.name == input) {//n cout << ///'学号：///' << pair.first << ///' 姓名：///' << pair.second.name << ///' 成绩：///' << pair.second.score << endl;//n found = true;//n }//n }//n //n if (!found) {//n cout << ///'未找到该学生！///' << endl;//n }//n } else {//n cout << ///'无效的选择！///' << endl;//n }//n}//n//nvoid modifyScore() {//n string id;//n float score;//n //n cout << ///'请输入要修改成绩的学生学号：///';//n cin >> id;//n //n if (students.find(id) != students.end()) {//n cout << ///'请输入新的成绩：///';//n cin >> score;//n //n students[id].score = score;//n //n cout << ///'成绩已修改！///' << endl;//n } else {//n cout << ///'未找到该学生！///' << endl;//n }//n}//n//nvoid outputAllScores() {//n for (const auto& pair : students) {//n cout << ///'学号：///' << pair.first << ///' 姓名：///' << pair.second.name << ///' 成绩：///' << pair.second.score << endl;//n }//n}//n//nvoid countPassAndExcellent() {//n int passCount = 0;//n int excellentCount = 0;//n //n for (const auto& pair : students) {//n if (pair.second.score >= 60) {//n passCount++;//n //n if (pair.second.score >= 90) {//n excellentCount++;//n }//n }//n }//n //n cout << ///'及格人数：///' << passCount << endl;//n cout << ///'优秀人数：///' << excellentCount << endl;//n}//n//nint main() {//n students[///'220101///'] = { ///'张三///', 92 };//n students[///'220102///'] = { ///'李四///', 85 };//n students[///'220103///'] = { ///'王五///', 70 };//n students[///'220104///'] = { ///'陈六///', 60 };//n students[///'220105///'] = { ///'钱七///', 80 };//n students[///'L220106///'] = { ///'Jessi///', 90 };//n students[///'L220107///'] = { ///'Yoon Suk Yeol///', 3 };//n //n int choice;//n //n while (true) {//n cout << ///'///' << endl;//n cout << ///'学生成绩管理系统///' << endl;//n cout << ///'///' << endl;//n cout << ///'///' << endl;//n cout << ///'1--输入数据///' << endl;//n cout << ///'2--查询成绩******///' << endl;//n cout << ///'3--修改成绩*********************///' << endl;//n cout << ///'4--输出所有学生成绩*************///' << endl;//n cout << ///'5--统计及格和优秀人数***********///' << endl;//n cout << ///'6--退出系统*********************///' << endl;//n cout << ///'0--清屏*************************///' << endl;//n cout << ///'************************************///' << endl;//n //n cout << ///'请选择操作：///';//n cin >> choice;//n //n switch (choice) {//n case 1://n inputData();//n break;//n case 2://n queryScore();//n break;//n case 3://n modifyScore();//n break;//n case 4://n outputAllScores();//n break;//n case 5://n countPassAndExcellent();//n break;//n case 6://n cout << ///'感谢使用！///' << endl;//n return 0;//n case 0://n system(///'cls///');//n break;//n default://n cout << ///'无效的选择！///' << endl;//n break;//n }//n }//n //n return 0;//n}//n/