// 学生成绩管理.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//
#include<iostream>
#include<string>
#define MAX 200
using namespace std;
struct student
{
string xingming, zhuanye, banji;
float xuehao=0;
float shuxue=0;
float yingyu=0;
float yuwen=0;
float avg = 0;//平均值
};
struct data
{
int count=0; // 当前学生数组中学生的个数
struct student stu[MAX]; // 学生数组
}dd;
// 显示主菜单
void menu()
{
cout<<"\n\n\n";
cout<<"\t\t\t *******************************\n";
cout<<"\t\t\t \n";
cout<<"\t\t\t 学生成绩管理系统 \n";
cout<<"\t\t\t \n";
cout<<"\t\t\t [1] 查看所有学生信息 \n";
cout<<"\t\t\t [2] 输入学生记录 \n";
cout<<"\t\t\t [3] 修改学生记录 \n";
cout<<"\t\t\t [4] 删除学生记录 \n";
cout<<"\t\t\t [5] 查询学生成绩(学号) \n";
cout<<"\t\t\t [6] 计算学生平均成绩 \n";
cout << "\t\t\t [7] 学生成绩排序 \n";
cout<<"\t\t\t [0] 退出 \n";
cout<<"\t\t\t \n";
}
// 查看所有学生信息
void view_data()
{
int i;
cout << "姓名\t学号\t专业\t班级\t数学\t英语\t语文\t平均分";
cout<<"\n-------------------------------------------------------------------\n";
for (i = 0; i < dd.count; i++)
cout << dd.stu[i].xingming << "\t" << dd.stu[i].xuehao << "\t" << dd.stu[i].zhuanye << "\t" << dd.stu[i].banji << "\t" << dd.stu[i].shuxue << "\t"
<< dd.stu[i].yingyu << "\t" << dd.stu[i].yuwen << "\t" << dd.stu[i].avg << "\n";
cout<<"\n-------------------------------------------------------------------\n";
}
// 输入学生记录
void add_data()
{
int b;
int k = dd.count;
while (k < MAX)
{
float tmp;
cout << "请输入学生姓名:"; cin >> dd.stu[k].xingming;
cout << "请输入学生学号:";
cin >> tmp;
while (!cin)
{
char ch;
while ((ch = getchar()) != '\n')
continue;
cout << "输入的不是数字,重新输入: ";
cin.clear();
cin >> tmp;
}
dd.stu[k].xuehao = tmp;
cout << "请输入学生专业:"; cin >> dd.stu[k].zhuanye;
cout << "请输入学生班级:"; cin >> dd.stu[k].banji;
cout << "请输入学生数学:"; cin >> tmp;
while (!cin)
{
char ch;
while ((ch = getchar()) != '\n')
continue;
cout << "输入的不是数字,重新输入: ";
cin.clear();
cin >> tmp;
}
dd.stu[k].shuxue =tmp;
cout << "请输入学生英语:"; cin >> tmp;
while (!cin)
{
char ch;
while ((ch = getchar()) != '\n')
continue;
cout << "输入的不是数字,重新输入: ";
cin.clear();
cin >> tmp;
}
dd.stu[k].yingyu = tmp;
cout << "请输入学生语文:"; cin >> tmp;
while (!cin)
{
char ch;
while ((ch = getchar()) != '\n')
continue;
cout << "输入的不是数字,重新输入: ";
cin.clear();
cin >> tmp;
}
dd.stu[k].yuwen = tmp;
dd.count++; //需要提前置0,在主函数中。
k = dd.count;
cout<<"\n\n继续添加学生信息[按1回车继续 0回车返回,其他回车退出]:";
cin >> b;
if (b != 1)
{
cin.clear();
break;
}
}
}
// 修改学生记录
void edit_data()
{
int i, k=-1;
float xuehao;
cout<<"\n请输入要修改学生的学号:";
cin >> xuehao;
while (!cin)
{
char ch;
while ((ch = getchar()) != '\n')
continue;
cout << "输入的不是数字,重新输入: ";
cin.clear();
cin >> xuehao;
}
for (i = 0; i < dd.count; i++)
{
if (dd.stu[i].xuehao== xuehao)
{
k = i;
break;
}
}
if (k == -1)
{
cout << "\n\n没有找到该学生(学号-"<< xuehao<<")!";
}
else
{
cout << "请输入" << xuehao << "学生姓名:"; cin >> dd.stu[k].xingming;
cout << "请输入"<< xuehao <<"学生专业:"; cin >> dd.stu[k].zhuanye;
cout << "请输入" << xuehao << "学生班级:"; cin >> dd.stu[k].banji;
float tmp;
cout << "请输入" << xuehao << "学生数学:"; cin >> tmp;
while (!cin)
{
char ch;
while ((ch = getchar()) != '\n')
continue;
cout << "输入的不是数字,重新输入: ";
cin.clear();
cin >> tmp;
}
dd.stu[k].shuxue = tmp;
cout << "请输入" << xuehao << "学生英语:"; cin >> tmp;
while (!cin)
{
char ch;
while ((ch = getchar()) != '\n')
continue;
cout << "输入的不是数字,重新输入: ";
cin.clear();
cin >> tmp;
}
dd.stu[k].yingyu = tmp;
cout << "请输入" << xuehao << "学生语文:"; cin >> tmp;
while (!cin)
{
char ch;
while ((ch = getchar()) != '\n')
continue;
cout << "输入的不是数字,重新输入: ";
cin.clear();
cin >> tmp;
}
dd.stu[k].yuwen = tmp;
cout<<"\n\n修改学生记录(学号-"<< xuehao <<")成功!";
}
}
//删除记录
void delete_data()
{
int i, k=-1;
float xuehao;
cout << "\n请输入要修改学生的学号:";
cin >> xuehao;
while (!cin)
{
char ch;
while ((ch = getchar()) != '\n')
continue;
cout << "输入的不是数字,重新输入: ";
cin.clear();
cin >> xuehao;
}
for (i = 0; i < dd.count; i++)
{
if (dd.stu[i].xuehao == xuehao)
{
k = i;//找到记录所在位置
break;
}
}
if (k == -1)
{
cout << "\n\n没有找到该学生(学号-" << xuehao << ")!";
}
else
{
for (i = k; i < dd.count - 1; i++)//将k位置的数据被k+1位置的信息覆盖
{
dd.stu[i] = dd.stu[i + 1];
}
dd.count--;
cout << "\n\n删除学生记录(学号-" << xuehao << ")成功!";
}
}
//学号查询成绩 //需要学号是有序的,不然实现不了折半查询
void qurey_data_xuehao()
{
float xuehao;
cout << "\n请输入要修改学生的学号:";
cin >> xuehao;
while (!cin)
{
char ch;
while ((ch = getchar()) != '\n')
continue;
cout << "输入的不是数字,重新输入: ";
cin.clear();
cin >> xuehao;
}
int low = 1;
int high = dd.count;
int mid;
while (low <= high)
{
mid = (low + high) / 2;
if (dd.stu[mid].xuehao == xuehao)
{
cout << "姓名\t学号\t专业\t班级\t数学\t英语\t语文";
cout << "\n-------------------------------------------------------------------\n";
cout << dd.stu[mid].xingming << "\t" << dd.stu[mid].xuehao << "\t" << dd.stu[mid].zhuanye << "\t" << dd.stu[mid].banji << "\t" << dd.stu[mid].shuxue << "\t"
<< dd.stu[mid].yingyu << "\t" << dd.stu[mid].yuwen << "\n";
cout << "\n-------------------------------------------------------------------\n";
return ;
}
else if (dd.stu[mid].xuehao > xuehao)
{
high = mid - 1;
}
else
{
low = mid + 1;
}
}
cout << "\n\n没有找到该学生(学号-" << xuehao << ")!";
}
void qurey_data_average()
{
int i;
for (i = 0; i < dd.count; i++)
dd.stu[i].avg = (dd.stu[i].shuxue + dd.stu[i].yingyu + dd.stu[i].yuwen) / 3;
cout << "\n计算完毕~!\n";
}
void sort_data()//排序 根据平均值排序
{
int i, j, N;
N = dd.count;
for (i = 0; i < N - 1; i++)
{
for (j = 0; j < N - 1 - i; j++)
{
if (dd.stu[j].avg < dd.stu[j + 1].avg)
{
student tmp; //临时变量
tmp = dd.stu[j]; //交换
dd.stu[j] = dd.stu[j + 1];
dd.stu[j + 1] = tmp;
}
}
}
qurey_data_average();
view_data();
}
int main() {
int a;
dd.count = 0;//开始0条记录
menu();
cin >> a;
while (a) {
switch (a)
{
case 1:view_data(); break;
case 2:add_data(); break;
case 3:edit_data(); break;
case 4: delete_data(); break;
case 5:qurey_data_xuehao(); break;
case 6:qurey_data_average(); break;
case 7:sort_data(); break;
default:
break;
}
menu();
cin >> a;
}
return 0;
}
C++ 学生成绩管理系统
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转载自blog.csdn.net/laocooon/article/details/121908992
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