C++程序：学生成绩管理系统——需要显示各科目的平均分与分数段人数
参考：
/* Note:Your choice is C IDE */
#include "stdio.h"
void main()
{
float a[3][7];
float b[7];
int i,j,k;
for(i=0;i<3;i++){
scanf("%f %f %f %f %f",&a[i][0],&a[i][1],&a[i][2],&a[i][3],&a[i][4]);
a[i][5]=a[i][1]+a[i][2]+a[i][3]+a[i][4];
a[i][6] = a[i][5]/4;
}
//排序
for(i=1;i<3;i++)
{
for(j=2;j>=i;j--)
{
if(a[j][6]<a[j-1][6]){
for(k=0;k<7;k++){
b[k]=a[j][k];
}
for(k=0;k<7;k++){
a[j][k]=a[j-1][k];
}
for(k=0;k<7;k++){
a[j-1][k]=b[k];
}
}
}
}
//输出
printf("学号\t语文\t数学\t英语\tC语言\t总分\t平均分\n");
for(i=0;i<3;i++){
printf("%.0f\t%.0f\t%.0f\t%.0f\t%.0f\t%.0f\t%.2f\n",a[i][0],a[i][1],a[i][2],a[i][3],a[i][4],a[i][5],a[i][6]);
}
}
#include <iostream>
#include <string.h>
#include <iomanip>
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#pragma warning(disable:4996) //解决Visual Studio中strcpy不安全报错问题
using namespace std;
int x = 0;
int* X = &x; //指针计数器
struct student
{
char name[10];
char number[100];
char sex[10];
float Chinese;
float math;
float English;
float AverageScore;
};
//--------------------------------------------------------------------------------------------------------------
//定义结构体数组：
struct student stu[100]; //限定100名学生
//--------------------------------------------------------------------------------------------------------------
//判断用户的输入是否正确(字符和字符串)：
float Check(int a)
{
if (a == 0) //针对字符和字符串
{
float m;
if (cin >> m)
{
return m;
}
else
{
cout << "输入错误，请重新输入:";
cin.clear();
cin.get();
while (!(cin >> m))
{
cout << "输入错误，请重新输入:";
cin.clear();
cin.get();
}
return m;
}
}
else if (a == 1) //针对字符和字符串以及StudentAve函数中菜单的数字范围
{
float m;
float c;
if (cin >> m)
{
while (1)
{
if (m == 1 || m == 2 || m == 3)
{
return m;
break;
}
else
{
cout << "输入错误，请重新输入:";
c = Check(1);
return c;
break;
}
}
}
else
{
cout << "输入错误，请重新输入:";
cin.clear();
cin.get();
while (!(cin >> m))
{
cout << "输入错误，请重新输入:";
cin.clear();
cin.get();
}
while (1)
{
if (m == 1 || m == 2 || m == 3)
{
return m;
break;
}
else
{
cout << "输入错误，请重新输入:";
c = Check(1);
return c;
break;
}
}
}
}
else if (a == 2) //针对字符和字符串以及重新查询和退出选择功能的数字范围
{
float m;
float c;
if (cin >> m)
{
while (1)
{
if (m == 1 || m == 2)
{
return m;
break;
}
else
{
cout << "输入错误，请重新输入:";
c = Check(2);
return c;
break;
}
}
}
else
{
cout << "输入错误，请重新输入:";
cin.clear();
cin.get();
while (!(cin >> m))
{
cout << "输入错误，请重新输入:";
cin.clear();
cin.get();
}
while (1)
{
if (m == 1 || m == 2)
{
return m;
break;
}
else
{
cout << "输入错误，请重新输入:";
a = Check(2);
return a;
break;
}
}
}
}
else if (a == 3) //针对字符和字符串以及重新查询和退出选择功能的数字范围
{
float m;
float c;
if (cin >> m)
{
while (1)
{
if (m == 1 || m == 2 || m == 3 || m == 4 || m == 5 || m == 6 || m == 7)
{
return m;
break;
}
else
{
cout << "输入错误，请重新输入:";
c = Check(3);
return c;
break;
}
}
}
else
{
cout << "输入错误，请重新输入:";
cin.clear();
cin.get();
while (!(cin >> m))
{
cout << "输入错误，请重新输入:";
cin.clear();
cin.get();
}
while (1)
{
if (m == 1 || m == 2 || m == 3 || m == 4 || m == 5 || m == 6 || m == 7)
{
return m;
break;
}
else
{
cout << "输入错误，请重新输入:";
a = Check(3);
return a;
break;
}
}
}
}
}
//--------------------------------------------------------------------------------------------------------------
//输入学生信息
void Create(int p)
{
if (x <= 100) //设置上限，该表存放最多不超过100名学生的信息
{
int Y = x;
cout << "请分别输入：姓名(不超过3个字)、学号（11位数字）、性别、语文成绩、数学成绩、英语成绩" << endl;
for (int i = Y; i < Y + p; i++)
{
cin >> stu[i].name >> stu[i].number >> stu[i].sex >> stu[i].Chinese >> stu[i].math >> stu[i].English;
if (i != Y + p - 1)
{
cout << "请输入下一个学生的信息：" << endl;
}
*X += 1; //记录表中人数
}
cout << endl << endl;
cout << "添加成功!" << endl << endl;
}
else
{
cout << "亲~表格人数已满，无法再继续添加了噢" << endl << endl << endl;
}
return;
}
//--------------------------------------------------------------------------------------------------------------
//输出所有学生信息
int DisplayAll(int a)
{
if (a == 0) //该函数基本功能的实现
{
cout << endl << "序号\t" << "姓名\t" << "学号\t\t" << "性别\t" << "语文\t" << "数学\t" << "英语\t" << endl;
for (int i = 0; stu[i].Chinese != 0; i++)
{
cout << i + 1 << ":\t";
cout << stu[i].name << "\t" << stu[i].number << "\t" << stu[i].sex << "\t" << stu[i].Chinese << "\t" << stu[i].math << "\t" << stu[i].English << endl;
}
cout << endl << endl;
}
else if (a == 1) //StudentAve调用DisplayAll函数专属通道
{
cout << endl << "序号\t" << "姓名\t" << "学号\t\t" << "性别\t" << "平均成绩\t" << endl;
for (int i = 0; stu[i].Chinese != 0; i++)
{
cout << i + 1 << ":\t";
cout << stu[i].name << "\t" << stu[i].number << "\t" << stu[i].sex << "\t" << fixed << setprecision(2) << stu[i].AverageScore << endl;
}
cout << endl << endl;
}
return 0;
}
//--------------------------------------------------------------------------------------------------------------
//查询某个学生信息
int DisplayOne(int b, float* a)
{
if (b == 0) //该函数基本功能的实现
{
char A[1000];
int c = 0;
cout << "请输入你想查询学生的姓名：";
cin >> A;
cout << endl << endl;
for (int i = 0; i < x; i++)
{
int a = strcmp(A, stu[i].name);
if (a == 0)
{
cout << "查询结果：" << endl;
cout << "姓名\t" << "学号\t\t" << "性别\t" << "语文\t" << "数学\t" << "英语\t" << endl;
cout << endl << stu[i].name << "\t" << stu[i].number << "\t" << stu[i].sex << "\t" << stu[i].Chinese << "\t" << stu[i].math << "\t" << stu[i].English << endl << endl;
return 1;
break;
}
else
{
c++;
}
}
if (c == x)
{
cout << "查无此人" << endl << endl;
return 0;
}
}
else if (b == 1) //StudentAve调用DisplayOne函数专属通道
{
char C[1000];
int d = 0;
cout << "请输入你想查询学生的姓名：";
cin >> C;
cout << endl << endl;
for (int i = 0; i < x; i++)
{
int a = strcmp(C, stu[i].name);
if (a == 0)
{
cout << "姓名\t" << "学号\t\t" << "性别\t" << "平均成绩\t" << endl;
cout << endl << stu[i].name << "\t" << stu[i].number << "\t" << stu[i].sex << "\t" << fixed << setprecision(2) << stu[i].AverageScore << endl << endl;
return 1;
break;
}
else
{
d++;
}
}
if (d == x)
{
cout << "查无此人" << endl << endl;
return 0;
}
}
else if (b == 2) //TopScore调用DisplayOne函数专属通道
{
for (int i = 0; i < x; i++)
{
if (*a == stu[i].AverageScore)
{
cout << "姓名\t" << "学号\t\t" << "性别\t" << "语文\t" << "数学\t" << "英语\t" << "平均成绩\t" << endl;
cout << endl << stu[i].name << "\t" << stu[i].number << "\t" << stu[i].sex << "\t" << stu[i].Chinese << "\t" << stu[i].math << "\t" << stu[i].English << "\t" << fixed << setprecision(2) << stu[i].AverageScore << endl << endl;
cout << "查询成功！" << endl << endl << endl;
break;
}
}
}
else if (b == 3) //FailExam调用DisplayOne函数专属通道
{
cout << "姓名\t" << "学号\t\t" << "性别\t" << "语文\t" << "数学\t" << "英语\t" << "平均成绩\t" << endl;
for (int i = 0; i < x; i++)
{
if (*a == stu[i].AverageScore)
{
cout << endl << stu[i].name << "\t" << stu[i].number << "\t" << stu[i].sex << "\t" << stu[i].Chinese << "\t" << stu[i].math << "\t" << stu[i].English << "\t" << fixed << setprecision(2) << stu[i].AverageScore << endl << endl;
break;
}
}
}
return 0;
}
//--------------------------------------------------------------------------------------------------------------
//计算任意一门课的平均成绩
void CourseAve()
{
char B[100];
cout << "请输入您所要查询平均成绩的科目：";
cin >> B;
int sum = 0, a = 0;
for (int i = 0; i < x; i++)
{
if (strcmp(B, "语文") == 0)
{
sum += stu[i].Chinese;
a++;
}
else if (strcmp(B, "数学") == 0)
{
sum += stu[i].math;
a++;
}
else if (strcmp(B, "英语") == 0)
{
sum += stu[i].English;
a++;
}
else
{
cout << "没有此学科，请重新输入" << endl;
CourseAve();
a = 0;
break;
}
}
if (a == x)
{
float ave = (float)sum / x;
cout << "该学科的平均成绩为：" << ave << endl << endl << endl;
}
}
//--------------------------------------------------------------------------------------------------------------
//计算每个学生三门课程的平均成绩
int StudentAve(int c)
{
if (c == 0) //录入平均成绩并提供查询功能
{
for (int i = 0; i < x; i++)
{
stu[i].AverageScore = (float)(stu[i].Chinese + stu[i].math + stu[i].English) / 3;
}
cout << "平均成绩录入成功！" << endl;
cout << "1.查看全部学生的平均成绩" << endl;
cout << "2.查看某个学生的平均成绩" << endl;
cout << "3.不查看" << endl;
cout << "输入数字选择要实现的功能：";
int a = Check(1);
if (a == 1) //查看全部学生的平均成绩
{
DisplayAll(1);
}
else if (a == 2) //查看某个学生的平均成绩
{
float* a = NULL;
while (1)
{
int k = DisplayOne(1, a);
if (k == 1)
{
cout << "查询成功！" << endl << endl;
break;
}
else
{
cout << "查询失败，是否重新查询？" << endl;
cout << "1.是" << endl;
cout << "2.否" << endl;
int j = Check(2);
if (j == 1)
{
continue;
}
else if (j == 2)
{
cout << endl << endl;
break;
}
}
}
}
}
else if (c == 1) //直接录入平均成绩，不提供查询功能
{
for (int i = 0; i < x; i++)
{
stu[i].AverageScore = (float)(stu[i].Chinese + stu[i].math + stu[i].English) / 3;
}
}
return 0;
}
//--------------------------------------------------------------------------------------------------------------
// 平均成绩最高分学生的查找
void TopScore()
{
StudentAve(1); //录入每位同学的平均成绩
//--------------------------------------------------------------------------------------------------------------
//找出平均成绩中的最大值
float max = stu[0].AverageScore;
for (int i = 1; i < x; i++)
{
if (max < stu[i].AverageScore)
{
max = stu[i].AverageScore;
}
}
float* b = &max; //利用指针进行地址传递
DisplayOne(2, b);
return;
}
//--------------------------------------------------------------------------------------------------------------
//找出平均成绩中不合格的同学
void FailExam()
{
StudentAve(1); //录入每位同学的平均成绩
float fail;
float* Fail = &fail; //利用指针进行地址传递
int k = 0; //计数器
for (int i = 0; i < x; i++)
{
if (stu[i].AverageScore < 60)
{
fail = stu[i].AverageScore;
DisplayOne(3, Fail);
}
else
{
k++;
}
}
if (k == x) //k=x即没有一位同学的成绩低于60分
{
cout << "全体及格!!!" << endl << endl << endl;
}
return;
}
//--------------------------------------------------------------------------------------------------------------
// 根据学号查询某学生是否存在
int IsExist(char b[100])
{
int k = 0;
for (int i = 0; i < x; i++)
{
int a = strcmp(b, stu[i].number);
if (a == 0)
{
return 1; //查询成功
break;
}
else
{
k++;
}
}
if (k == x)
{
return 0; //查询失败
}
}
void Search()
{
char b[100];
cout << "请输入你所要查询的学号：";
cin >> b;
int back = IsExist(b); //调用IsExist函数判断该学生是否存在
if (back == 1)
{
StudentAve(1); //录入每位同学的平均成绩
for (int i = 0; i < x; i++)
{
int a = strcmp(b, stu[i].number);
if (a == 0)
{
cout << endl << endl;
cout << "姓名\t" << "学号\t\t" << "性别\t" << "语文\t" << "数学\t" << "英语\t" << "平均成绩\t" << endl;
cout << endl << stu[i].name << "\t" << stu[i].number << "\t" << stu[i].sex << "\t" << stu[i].Chinese << "\t" << stu[i].math << "\t" << stu[i].English << "\t" << fixed << setprecision(2) << stu[i].AverageScore << endl << endl;
cout << "查询成功！！！" << endl << endl;
break;
}
}
}
else if(back == 0)
{
cout << "查无此人" << endl << endl;
}
return;
}
//--------------------------------------------------------------------------------------------------------------
// 修改学生信息
void Modify()
{
char c[100];
cout << "请输入你所要查询的学号：";
cin >> c;
int back = IsExist(c); //调用IsExist函数判断该学生是否存在
int f = 0; //定位器
if (back == 1)
{
StudentAve(1); //录入每位同学的平均成绩
for (int i = 0; i < x; i++) //查找出该同学在结构体数组中的下标
{
int a = strcmp(c, stu[i].number);
if (a == 0)
{
f = i;
}
}
while (1) //修改信息
{
cout << endl << endl;
StudentAve(1); //考虑到成绩的修改，此处重新录入每位同学的平均成绩
cout << "姓名\t" << "学号\t\t" << "性别\t" << "语文\t" << "数学\t" << "英语\t" << "平均成绩\t" << endl;
cout << endl << stu[f].name << "\t" << stu[f].number << "\t" << stu[f].sex << "\t" << stu[f].Chinese << "\t" << stu[f].math << "\t" << stu[f].English << "\t" << fixed << setprecision(2) << stu[f].AverageScore << endl << endl;
cout << "+------------+" << endl;
cout << "| 1.姓名 |" << endl;
cout << "| 2.学号 |" << endl;
cout << "| 3.性别 |" << endl;
cout << "| 4.语文成绩 |" << endl;
cout << "| 5.数学成绩 |" << endl;
cout << "| 6.英语成绩 |" << endl;
cout << "| 7.退出修改 |" << endl;
cout << "+------------+" << endl;
cout << "请选择你要修改的内容（输入数字）：";
int b = Check(3);
cout << endl << endl;
if (b == 1) //改姓名
{
char name[10];
cout << "修改为（不超过三个字）：";
cin >> name;
strcpy(stu[f].name, name);
cout << endl << endl;
cout << "修改成功！";
}
else if (b == 2) //改学号
{
char number[100];
cout << "修改为（11位数字）：";
cin >> number;
strcpy(stu[f].number, number);
cout << endl << endl;
cout << "修改成功！";
}
else if (b == 3) //改性别
{
char sex[100];
cout << "修改为：";
cin >> sex;
strcpy(stu[f].sex, sex);
cout << endl << endl;
cout << "修改成功！";
}
else if (b == 4) //改语文成绩
{
cout << "修改为：";
float Chinese = Check(0);
stu[f].Chinese = Chinese;
cout << endl << endl;
cout << "修改成功！";
}
else if (b == 5) //改数学成绩
{
cout << "修改为：";
float math = Check(0);
stu[f].math = math;
cout << endl << endl;
cout << "修改成功！";
}
else if (b == 6) //改英语成绩
{
cout << "修改为：";
float English = Check(0);
stu[f].English = English;
cout << endl << endl;
cout << "修改成功！";
}
else if (b == 7) //退出修改
{
cout << "退出成功！" << endl << endl;
break;
}
}
}
else if (back == 0)
{
cout << "查无此人" << endl << endl;
}
return;
}
//--------------------------------------------------------------------------------------------------------------
//主体部分
int main()
{
//--------------------------------------------------------------------------------------------------------------
//初始化界面
system("color F0"); //设置背景色为白色，字体颜色为黑色
cout << "+------------------------+" << endl;
cout << "| Programmer：豆漿油條 |" << endl;
cout << "| Version：3.8.4 |" << endl;
cout << "+------------------------+" << endl << endl << endl << endl << endl << endl << endl << endl << endl << endl;
cout << "\t\t\t\t\t 欢迎使用学生成绩管理系统！！！" << endl;
Sleep(5000); //延时5秒
system("cls"); //清屏
//--------------------------------------------------------------------------------------------------------------
//菜单界面
while (1)
{
//--------------------------------------------------------------------------------------------------------------
//菜单选项：
cout << "+-----------------------------------------+" << endl;
cout << "| 1.录入学生信息 |" << endl;
cout << "| 2.查看所有学生信息 |" << endl;
cout << "| 3.查询某个学生信息 |" << endl;
cout << "| 4.查看任意一门课的平均成绩 |" << endl;
cout << "| 5.录入所有学生的平均成绩（附带查询功能）|" << endl;
cout << "| 6.查看平均成绩最高分的学生 |" << endl;
cout << "| 7.查看平均成绩不及格的学生 |" << endl;
cout << "| 8.给定学号查询学生 |" << endl;
cout << "| 9.给定学号修改学生信息 |" << endl;
cout << "| 0.退出程序 |" << endl;
cout << "+-----------------------------------------+" << endl;
cout << "请输入数字以实现功能:";
//--------------------------------------------------------------------------------------------------------------
//利用Check函数判断用户的输入是否正确(字符和字符串)：
float n = Check(0);
cout << endl << endl;
//--------------------------------------------------------------------------------------------------------------
//按钮对应功能的实现：
if (n == 1)
{
cout << "请输入你要添加学生的人数：";
int p = Check(0);
Create(p);
Sleep(3000); //延时3秒
system("cls"); //清屏
}
else if (n == 2)
{
DisplayAll(0);
system("pause"); //界面静止
system("cls"); //清屏
}
else if (n == 3)
{
float* a = NULL;
while (1)
{
int k = DisplayOne(0, a);
if (k == 1)
{
cout << "查询成功！" << endl << endl;
break;
}
else
{
cout << "查询失败，是否重新查询？" << endl;
cout << "1.是" << endl;
cout << "2.否" << endl;
int j = Check(2);
if (j == 1)
{
continue;
}
else if (j == 2)
{
cout << endl << endl;
break;
}
}
}
system("pause"); //界面静止
system("cls"); //清屏
}
else if (n == 4)
{
CourseAve();
system("pause"); //界面静止
system("cls"); //清屏
}
else if (n == 5)
{
StudentAve(0);
system("pause"); //界面静止
system("cls"); //清屏
}
else if (n == 6)
{
TopScore();
system("pause"); //界面静止
system("cls"); //清屏
}
else if (n == 7)
{
FailExam();
system("pause"); //界面静止
system("cls"); //清屏
}
else if (n == 8)
{
Search();
system("pause"); //界面静止
system("cls"); //清屏
}
else if (n == 9)
{
Modify();
system("pause"); //界面静止
system("cls"); //清屏
}
else if (n == 0)
{
cout << "你真的要退出了吗？" << endl;
cout << "1.强忍离去" << endl;
cout << "2.继续使用" << endl;
float a = Check(2);
cout << endl << endl;
if (a == 1)
{
system("cls"); //清屏
cout << endl << endl << endl << endl << endl << endl << endl << endl << endl << endl << endl << endl << endl << "\t\t\t\t\t\t 期待您的下次使用！" << endl << endl << endl;
Sleep(3000); //延时3秒
break;
}
else if (a == 2)
{
system("cls"); //清屏
continue;
}
}
//--------------------------------------------------------------------------------------------------------------
//判断用户的输入是否正确(非餐单中的整型数字)：
else
{
cout << "您输入数字有误，请重新输入" << endl << endl << endl;
}
//--------------------------------------------------------------------------------------------------------------
}
return 0;
}
有谁能在这个的基础上改一下的嘛！
课程设计：c++实现学生成绩管理系统_feinifi的博客-CSDN博客_c++学生成绩管理系统 https://blog.csdn.net/feinifi/article/details/110249811