【简单项目实战】用C++实现学生成绩管理系统

●功能介绍

●案例

●代码展示

●结果展示

●功能介绍

用 C++设计一个程序，能提供下列功能:

1. 录入学生成绩信息。按照学号，姓名，语文，数学，英语的格式录入学生的成绩。

2.展示目前录入学生的成绩信息。以学号，姓名，语文，数学，英语的格式按列表展示。

3.查询成绩。根据学生的学号或姓名查询学生的成绩。

4.修改。通过姓名查询找到相应的学生记录并对其进行修改。

5.统计。计算学生的总分并按顺序显示输出；统计班级学生的每门课程的平均分和全班人总分的平
均分并显示；统计个人总得分小于班级总分的学生并显示为不及格学生名单。

6.删除。删除指定学生成绩信息。

7.清空。清空学生表所有成绩信息。

●案例

1.录入5个学生的信息：

①1001 zhangsan 80 90 70

②1002 lisi 60 65 75

③1003 wangwu 75 85 100

④1004 zhaoliu 50 60 40

⑤1005 sunqi 70 85 95

2.展示已输入5个的学生成绩信息

3.用学号去查询zhaoliu的各科成绩

4.实现统计，查看学生成绩信息和不及格学生

5.对wangwu的语文成绩进行单科修改，修改为80（若要进行整体修改，按操作提示执行即可，这里只修改其语文成绩）

6.用姓名去查询wangwu的各科成绩

7.因为lisi的成绩录入错误，所以删除他的所有信息

8.展示目前剩余学生的成绩信息

9.操作完成清空学生成绩信息

●代码展示

#include <iostream>
#include <string>
#define max 100   //学生人数
using namespace std;
struct person {string id;string name;int chinese;int math;int english;
};
struct student_information {struct person data[max];int size;
};
void addinformation(student_information* si)
{if (si->size == max){cout << "学生信息表已满" << endl;}else{cout << "请输入学号：" << endl;string id;cin >> id;si->data[si->size].id = id;cout << "请输入姓名：" << endl;string name;cin >> name;si->data[si->size].name = name;cout << "请输入语文成绩：" << endl;int chinese;cin >> chinese;si->data[si->size].chinese = chinese;cout << "请输入数学成绩：" << endl;int math;cin >> math;si->data[si->size].math = math;cout << "请输入英语成绩：" << endl;int english;cin >> english;si->data[si->size].english = english;si->size++;cout << "<<添加成功>>" << endl;system("pause");system("cls");}
}
void showperson(student_information* si)
{if (si->size == 0) {cout << "当前数据为空！" << endl;}else {for (int i = 0; i < si->size; i++){cout << "学号：" << si->data[i].id<<" "<< "姓名：" << si->data[i].name<<" "<< "语文成绩：" << si->data[i].chinese<<" "<< "数学成绩：" << si->data[i].math<<" "<< "英语成绩：" << si->data[i].english << endl;}system("pause");system("cls");}
}
int isexist(student_information* si, string id)
{for (int k = 0; k < si->size; k++){if (si->data[k].id == id)return k;}return -1;
}
int isexist_1(student_information* si, string name)
{for (int k = 0; k < si->size; k++){if (si->data[k].name == name)return k;}return -1;
}
void searchperson(student_information* si)
{cout << "请输入您要查找的学生：" << endl;cout << "如果按照学号查找输入1" << endl;cout << "如果按照姓名查找输入2" << endl;int n; cin >> n;string id, name;if (n == 1) {cin >> id;if (isexist(si, id) == -1) {cout << "此人不存在！" << endl;}else {cout << "此人存在!" << endl;int ret = isexist(si, id);{cout << "学号 " << si->data[ret].id << "\t";cout << "姓名 " << si->data[ret].name << "\t";cout << "语文成绩 " << si->data[ret].chinese << "\t";cout << "数学成绩 " << si->data[ret].math << "\t";cout << "英语成绩 " << si->data[ret].english << "\t";}}}else {cin >> name;if (isexist_1(si, name) == -1) {cout << "此人不存在！" << endl;}else {cout << "此人存在!" << endl;int ret_1 = isexist_1(si, name);{cout << "学号 " << si->data[ret_1].id << "\t";cout << "姓名 " << si->data[ret_1].name << "\t";cout << "语文成绩 " << si->data[ret_1].chinese << "\t";cout << "数学成绩 " << si->data[ret_1].math << "\t";cout << "英语成绩 " << si->data[ret_1].english << "\t";}}}system("pause");system("cls");
}
void alterperson(student_information* si)
{cout << "请输入您要修改的联系人：" << endl;string name;cin >> name;if (isexist_1(si, name) == -1){cout << "此人不存在！" << endl;}else{cout << "此人存在!" << endl;int ret_2 = isexist_1(si,name);cout << "单一修改-0" << "多数修改-1" << endl;int sign; cin >> sign;{if (sign == 0){cout << "学号-1" << "姓名-2" << "语文成绩-3" << "数学成绩-4" << "英语成绩-5" << endl;int select_1; cin >> select_1;if (select_1 == 1) {string id; cin >> id;si->data[ret_2].id = id;}if (select_1 == 2) {string name; cin >> name;si->data[ret_2].name = name;}if (select_1 == 3) {int chinese; cin >> chinese;si->data[ret_2].chinese = chinese;}if (select_1 == 4) {int math; cin >> math;si->data[ret_2].math = math;}if (select_1 == 5) {int english; cin >> english;si->data[ret_2].english = english;}}}if (sign == 1){cout << "请输入学号：" << endl;string id; cin >> id;si->data[ret_2].id = id;cout << "请输入姓名：" << endl;string name; cin >> name;si->data[ret_2].name = name;cout << "请输入语文成绩：" << endl;int chinese; cin >> chinese;si->data[ret_2].chinese = chinese;cout << "请输入数学成绩：" << endl;int math; cin >> math;si->data[ret_2].math = math;cout << "请输入英语成绩：" << endl;int english; cin >> english;si->data[ret_2].english = english;}}cout << "信息修改成功！" << endl;system("pause");system("cls");
}
void staticperson(student_information* si)
{int allsum = 0;for (int i = 0; i < si->size; i++){int sum = 0;sum = si->data[i].chinese + si->data[i].math + si->data[i].english;cout << "姓名：" << si->data[i].name << "语文：" << si->data[i].chinese << " " << "数学：" << si->data[i].math << " " << "英语：" << si->data[i].english << " " << "总分：" << sum << endl;allsum += sum;}int sum1 = 0, sum2 = 0, sum3 = 0;for (int i = 0; i < si->size; i++){sum1 += si->data[i].chinese;sum2 += si->data[i].math;sum3 += si->data[i].english;}cout << "全班语文平均分：" << sum1 / si->size << endl;cout << "全班数学平均分：" << sum2 / si->size << endl;cout << "全班英语平均分：" << sum3 / si->size << endl;cout << "全班总分的平均分：" << allsum / si->size << endl;for (int i = 0; i < si->size; i++){int sum = 0;sum = si->data[i].chinese + si->data[i].math + si->data[i].english;if (sum < allsum/si->size){cout << "得分小于班级总分平均分的不及格学生：" << si->data[i].id << " " << si->data[i].name << endl;}}system("pause");system("cls");
}
void deleteperson(student_information* si)
{cout << "请输入您要删除的学生：" << endl;string name;cin >> name;if (isexist_1(si, name) == -1) {cout << "查无此人！" << endl;}else {cout << "找到此人！" << endl;int ret = isexist_1(si, name);for (int l = ret; l < si->size; l++){si->data[l].id = si->data[l + 1].id;si->data[l].name = si->data[l + 1].name;si->data[l].chinese = si->data[l + 1].chinese;si->data[l].math = si->data[l + 1].math;si->data[l].english = si->data[l + 1].english;}//abs->arrar[l]=abs->array[l+1];si->size--;cout << "已删除此学生信息！" << endl;}system("pause");system("cls");
}
void emptyperson(student_information* si)
{si->size = 0;cout << "成绩表已清空！" << endl;system("pause");system("cls");
}
void showmenu()
{cout << "*************************" << endl;cout << "*****1:录入学生信息*****" << endl;cout << "*****2:展示学生信息******" << endl;cout << "*****3:查找学生信息******" << endl;cout << "*****4:修改学生信息******" << endl;cout << "*****5:统计学生信息******" << endl;cout << "*****6:删除学生信息******" << endl;cout << "*****7:清空学生信息******" << endl;cout << "*************************" << endl;
}
void text()
{student_information SI;SI.size = 0;while (1){showmenu();int n; cin >> n;switch (n){case 1:addinformation(&SI);break;case 2:showperson(&SI);break;case 3:searchperson(&SI);break;case 4:alterperson(&SI);break;case 5:staticperson(&SI);break;case 6:deleteperson(&SI);break;case 7:emptyperson(&SI);break;}}
}
int main()
{text();
}

●结果展示