C学生成绩标准管理系统源代码.doc

#include<iostream.h>
#include<fstream.h>
#include<stdlib.h>
#include<string.h>
#include<stdio.h>
class Person
{ public:char name[8];
};
class student:public Person //构建学生类
{
public:
friend void Manage(student stud[]) ;
friend void Input(student stud[]) ;
friend void Statistic(student stud[]);
friend void Lookup(student stud[]) ;
friend void Modify(student stud[]) ;
friend void Output(student stud[]) ;
friend void Insert(student stud[]) ;
friend void Write(student stud[],int n);
friend int Read(student stud[]);
private:
int num;
char name[8];
char class_0[20];
float c_program;
float english;
float math;
float average;
int order;
}stud[100];
class Manage:public student
{};
void Write(student stud[],int n) //向文件中写入数据
{
fstream myFile;
myFile.open("score.txt",ios::out|ios::binary);
if(!myFile)
{
cout<<"score.txt can't open!"<<endl;
abort();
}
int count=n;
myFile<<count<<endl<<endl;
for(int i=0;i<=count;i++)
{
myFile<<stud[i].class_0<<" "<<stud[i].num<<" "<<stud[i].name<<" "<<stud[i].c_program<<" "<<stud[i].english<<" "<<stud[i].math<<" "<<stud[i].average<<endl;
}
myFile.close();
}
int Read(student stud[]) //从文件中读数据
{

fstream myFile;
myFile.open("score.txt",ios::in|ios::binary);
if(!myFile)
{
cout<<"score.txt can't open!"<<endl;
abort();
}
int count;
myFile.seekg(0);
myFile>>count;
for(int i=0;i<=count;i++)
{
myFile>>stud[i].class_0>>stud[i].num>>stud[i].name>>stud[i].c_program>>stud[i].english>>stud[i].math >>stud[i].average;
}
myFile.close();
return count ;
}
void Input(student stud[]) //---------------输入学生成绩
{
system("cls"); /*运行前清屏*/
int i=0;
int flag;
char sign;
cout<<endl<<">>>>>>>> 请输入学生成绩 <<<<<<<<\n"<<endl;
while(sign!='n'&&sign!='N') /*判定*/
{
cout<<"班级:"; /*交互输入*/
cin>>stud[i].class_0;
loop:
cout<<"学号:";
cin>>stud[i].num;
int c=0;
while(c<i)
{
c++;
if(stud[i].num==stud[i-c].num)
{
cout<<"你输入学号已经存在!请重新输入!"<<endl;
goto loop;
}
}
cout<<"姓名:";
cin>>stud[i].name;
do{
flag=0;
cout<<"C++成绩:";
cin>>stud[i].c_program;
if(stud[i].c_program>100 ||stud[i].c_program<1)
cout<<"请输入1-100之间数字!\n";
else
flag=1;
}while(flag==0);
do{
flag=0;
cout<<"英语成绩:";
cin>>stud[i].english;
if(stud[i].english>100 ||stud[i].english<1)
cout<<"请输入1-100之间数字!\n";
else
flag=1;
}while(flag==0);
do{
flag=0;
cout<<"数学成绩:";
cin>>stud[i].math;
if(stud[i].math>100 ||stud[i].math<1)
cout<<"请输入1-100之间数字!\n";
else
flag=1;
}while(flag==0);

stud[i].average=(stud[i].c_program+stud[i].english+stud[i].math)/3;
cout<<"平均分："<<stud[i].average<<endl;
cout<<"继续录入学生成绩?(y/n)";
cin>>sign; /*输入判定*/
i++;
}
Write(stud,i);
}
void Statistic(student stud[]) //---------------统计学生数据
{
system("cls"); /*运行前清屏*/
int n=Read(stud);
cout<<endl<<">>>>>>>> 显示学生成绩 <<<<<<<<\n"<<endl;
cout<<"班级"<<"\t "<<"学号"<<"\t "<<" 姓名"<<"\t "<<" 平均分"<<endl;
for(int i=0;i<n;i++)
cout<<stud[i].class_0<<"\t"<<stud[i].num<<"\t"<<stud[i].name<<"\t "<<stud[i].average<<endl;
system("pause");
}
void Lookup(student stud[]) //---------------查找学生成绩
{int p;
cout<<"请选择1.按学号查找 2.按姓名查找"<<endl;
cin>>p;
if(p==1)
{
system("cls"); /*运行前清屏*/
int n=Read(stud);
int s;
int i=0;
cout<<endl<<">>>>>>>> 查找学生成绩 <<<<<<<<\n"<<endl;
cout<<"请输入查找学生学号:"<<endl;
cin>>s;
while((stud[i].num-s)!=0&&i<n) i++; /*查找判定*/
if(i==n)
{
cout<<"没有该学生信息！"<<endl; /*输入失败信息*/
}
else
{
cout<<"---------------------------"<<endl;
cout<<"班级:"<<stud[i].class_0<<endl; /*输出该学生信息*/
cout<<"学号:"<<stud[i].num<<endl;
cout<<"姓名:"<<stud[i].name<<endl;
cout<<"C++:"<<stud[i].c_program<<endl;
cout<<"英语:"<<stud[i].english<<endl;
cout<<"数学:"<<stud[i].math<<endl;
cout<<"平均分:"<<stud[i].average<<endl;
}
}
if(p==2)
{system("cls"); /*运行前清屏*/
int m=Read(stud);
char t;
int i=0;
cout<<endl<<">>>>>>>> 查找学生成绩 <<<<<<<<\n"<<endl;
cout<<"请输入查找学生姓名:"<<endl;
cin>>t;
while(strcmp(stud[i].name-t,stud[i].name)==0&&i<m) i++; /*查找判定*/

{
cout<<"---------------------------"<<endl;
cout<<"班级:"<<stud[i].class_0<<endl; /*输出该学生信息*/
cout<<"学号:"<<stud[i].num<<endl;
cout<<"姓名:"<<stud[i].name<<endl;
cout<<"C++:"<<stud[i].c_program<<endl;
cout<<"英语:"<<stud[i].english<<endl;
cout<<"数学:"<<stud[i].math<<endl;
cout<<"平均分:"<<stud[i].average<<endl;
}
}

}

void Modify(student stud[]) //---------------修改学生成绩
{
system("cls"); /*运行前清屏*/
int n=Read(stud);
int s,a; float q;
int i=0;
cout<<endl<<">>>>>>>> 修改学生成绩 <<<<<<<<\n"<<endl;
cout<<"输入修改成绩学生学号:"<<endl;
cin>>s;
while((stud[i].num-s)!=0&&i<n) i++; /*查找判定*/
if(i==n)
{
cout<<"没有该学生成绩!"<<endl; /*输入失败信息*/
}
else
{
cout<<"----------该学生信息----------\n"<<endl; /*格式头*/
cout<<"班级"<<"\t"<<"学号 "<<"\t"<<"姓名"<<"\t"<<"c++"<<"\t"<<"英语"<<"\t"<<"数学"<<"\t"<<"平均分"<<endl;
cout<<"---------------------------------"<<endl;
cout<<stud[i].class_0<<"\t"<<stud[i].num<<"\t"<<stud[i].name<<"\t"<<stud[i].c_program<<"\t"<<stud[i].english<<"\t"<<stud[i].math<<"\t"<<stud[i].average<<endl;
cout<<"---------------------------------"<<endl;
cout<<"请输入要修改课程号"<<endl;
cout<<"1.c语言 2.英语 3.数学"<<endl;
cin>>a;
cout<<"重新输入分数"<<endl;
cin>>q;
if(a==1) stud[i].c_program=q;
if(a==2)stud[i].english=q;
if(a==3)stud[i].math=q;

stud[i].average=(stud[i].c_program+stud[i].english+stud[i].math)/3;
cout<<"----------该学生信息----------\n"<<endl; /*格式头*/
cout<<"班级"<<"\t"<<"学号 "<<"\t"<<"姓名"<<"\t"<<"c++"<<"\t"<<"英语"<<"\t"<<"数学"<<"\t"<<"平均分"<<endl;
cout<<"---------------------------------"<<endl;
cout<<stud[i].class_0<<"\t"<<stud[i].num<<"\t"<<stud[i].name<<"\t"<<stud[i].c_program<<"\t"<<stud[i].english<<"\t"<<stud[i].math<<"\t"<<stud[i].average<<endl;

char c;
cout<<"是否保留数据?(y/n)"<<endl;
cin>>c;
if(c!='n'&&c!='N')
Write(stud,n);
}
}
void Insert(student stud[]) //---------------增加学生成绩
{
system("cls"); /*运行前清屏*/
int n=Read(stud);
char s;
cout<<endl<<"************ 插入学生成绩***********\n"<<endl;
while(s!='n'&&s!='N')
{
cout<<"班级:"<<endl; /*交互输入*/
cin>>stud[n].class_0;
cout<<"学号:";
cin>>stud[n].num;
cout<<"姓名:";
cin>>stud[n].name;
cout<<"C++成绩:";
cin>>stud[n].c_program;
cout<<"英语成绩:";
cin>>stud[n].english;
cout<<"数学成绩:";
cin>>stud[n].math;
stud[n].average=(stud[n].c_program+stud[n].english+ stud[n].math)/3;
cout<<"平均分"<<stud[n].average;
n++;
cout<<"插入成功！"<<endl; /*返回成功信息*/
cout<<"是否继续输入(y/n)"<<endl;
cin>>s;
}
Write(stud,n);
}
void Manage(student stud[]) //---------------按平均分对学生成绩统计项进行降序排序
{
system("cls"); /*运行前清屏*/
int i,j,k;
float s;
char t[20];
cout<<endl<<"********** 排列管理成绩 **********\n"<<endl;
int n=Read(stud);
for(i=0;i<n-1;i++) /*冒泡法排序*/
for(j=0;j<n-1-i;j++)
if(stud[j].average<stud[j+1].average)
{
strcpy(t,stud[j+1].class_0);
strcpy(stud[j+1].class_0,stud[j].class_0);
strcpy(stud[j].class_0,t);
k=stud[j+1].num;
stud[j+1].num=stud[j].num;
stud[j].num=k;
strcpy(t,stud[j+1].name);
strcpy(stud[j+1].name,stud[j].name);
strcpy(stud[j].name,t);
s=stud[j+1].c_program;
stud[j+1].c_program=stud[j].c_program;
stud[j].c_program=s;
s=stud[j+1].english;
stud[j+1].english=stud[j].english;
stud[j].english=s;
s=stud[j+1].math;
stud[j+1].math=stud[j].math;
s=stud[j+1].average;
stud[j+1].average=stud[j].average;
stud[j].average=s;
}
cout<<"-------------------------------------"<<endl; /*格式头*/
cout<<"班级"<<"\t "<<"学号"<<"\t "<<"姓名"<<"\t"<<"C++"<<"\t"<<"英语"<<"\t"<<"数学"<<"\t"<<"平均分"<<"\t"<<"名次"<<endl;

for(i=0;i<n;i++) /*循环输入*/
{
stud[i].order=i+1;
cout<<stud[i].class_0<<"\t"<<stud[i].num<<"\t"<<stud[i].name<<"\t"<<stud[i].c_program<<"\t"<<stud[i].english<<"\t"<<stud[i].math<<"\t"<<stud[i].average<<"\t "<<stud[i].order<<endl;
}
Write(stud,n);
}
void Output(student stud[]) //---------------显示全部学生成绩
{
system("cls"); /*运行前清屏*/
int n=Read(stud);
cout<<"***************** 显示班级学生成绩 *****************\n"<<endl;
if(!stud)
cout<<"没有统计";
else
{
cout<<"-------------------------------------------------------------------------"<<endl; /*格式头*/
cout<<"班级"<<"\t "<<"学号"<<"\t "<<"姓名"<<"\t"<<"c++"<<"\t"<<"英语"<<"\t"<<"数学"<<"\t"<<"平均分"<<endl;
for(int i=0;i<n;i++) /*循环输入*/
{
cout<<stud[i].class_0<<"\t"<<stud[i].num<<"\t"<<stud[i].name<<"\t"<<stud[i].c_program<<"\t "<<stud[i].english<<"\t " <<stud[i].math<<"\t"<<stud[i].average<<endl;
}
cout<<"-------------------------------------------------------------------------"<<endl;
}
}
int menu() /*菜单函数*/
{
char c;
do
{
system("cls"); /*运行前清屏*/
cout<<"*******************************************************\n"<<endl;
cout<<" -----------------欢迎使用学生成绩管理系统-------------\n"<<endl;
cout<<" $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$"<<endl;
cout<<" * 【1】输入学生成绩 * "<<endl;
cout<<" * 【2】显示学生成绩 * "<<endl;
cout<<" * 【3】查找学生成绩 * "<<endl;
cout<<" * 【4】修改学生成绩 * "<<endl;
cout<<" * 【5】插入学生成绩 * "<<endl;
cout<<" * 【6】排列管理成绩 * "<<endl;
cout<<" * 【7】显示班级学生成绩 * "<<endl;
cout<<" * 【0】退出本系统 * " <<endl;
cout<<" $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ "<<endl;
cout<<"请你选择(0-7):"<<endl;
c=getchar(); /*读入选择*/
}
while(c<'0'||c>'8');
return(c-'0'); /*返回选择*/
}
void main() /*主函数*/
{
for(;;)
{
switch(menu()) /*选择判定*/
{
case 1:
Input(stud);/*输入学生成绩*/
break;
case 2:
Statistic(stud); /*输出学生统计数据*/
break;
case 3:
Lookup(stud); /*查找学生成绩*/
cout<<"\t\t\t";
system("pause");
break;
case 4:
Modify(stud); /*修改学生成绩*/
cout<<"\t\t\t";
system("pause");
break;
case 5:
Insert(stud);/*增加学生成绩*/
cout<<"\t\t\t";
system("pause");
break;
case 6:
Manage(stud); /*按平均分对成绩统计项进行降序排序*/
cout<<"\t\t\t";
system("pause");
break;
case 7:
Output(stud); /*显示全部学生成绩*/
cout<<"\t\t\t";
system("pause");
break;
case 0:
cout<<endl<<" ===========================感谢您使用学生成绩管理系统==========================\n"<<endl; /*结束程序*/
cout<<"\t\t\t";
system("pause");
exit(0);
}
}
}