c++问题 按下列要求实现一个有关学生成绩操作
#include
#include
class Student
{
public:
char name[20];
int score[6];
int setmessage(void);
};
int Student::setmessage(void)
{
cout<<"姓名:";
cin>>name;
cout<<endl;
int i;
for(i=0;i<5;i++)
{
cout<<"该学生第"<<i+1<<"门成绩:"; //改为i+1好些
cin>>score[i];
cout<<endl;
}
score[5]=0; //这里要初始化
for(i=0;i<5;i++)
score[5]+=score[i]; ///溢出
return 0;
}
int main(void)
{
Student stu[5];
int count,max,i;
max=i=0;
for(count=0;count<5;count++)
{
stu[count].setmessage();//函数少了括号
}
while(i<5){
if(stu[max].score[5]<stu[i].score[5]) //把6改为5
max=i;
i++;
}
cout<<"最高分为"<<stu[max].name<<endl;
cout<<"分数为"<<stu[max].score[5]<<endl;
return 0;
}
#include
#include
#include
#include
#include
using namespace std;
class StuInfor
{
private:
int S_Position; //输出次序
string S_Number; //学号
string S_Name; //姓名
float S_Score_Math; //数学分数
float S_Score_Chinese; //语文分数
float S_Score_English; //英语分数
float S_Score_Totle; //总分
char S_Rank; //排名
string S_Other; //备注
bool Open_flag;
int Record;
public:
StuInfor();
virtual ~StuInfor();
void Cmenu(StuInfor &L); // 菜单函数
void ReadFromFile(StuInfor &L); // 读入数据
void PrintAll(StuInfor &L); // 打印全部
void SavetoFile(StuInfor &L); // 写入文件即保存
void Search_Listmember(StuInfor &L); // 查找成员
void Search_On_Name(StuInfor &L); // 按姓名查找
void Search_On_Number(StuInfor &L); // 按学号查找
void ModifyMember(StuInfor &L); // 修改成员数据
void DelMember(StuInfor &L); // 删除数据成员
void InsertMember(StuInfor &L); // 插入数据成员
};
StuInfor::StuInfor() // 构造函数进行一些初始化
{
Record=0;
Open_flag=false;
S_Rank=' ';
}
StuInfor::~StuInfor()
{
}
//////////////////////////////////////////////////////////////////////////
StuInfor stu[50]; //定义对象数组，来存放数据，每一个学生数据即是一个对象
//////////////////////////////////////////////////////////////////////////
void StuInfor::Cmenu(StuInfor &L) // 菜单函数实现
{
system("cls"); //清屏
cout<<"
Student Information Management System"<<endl;
cout<<"
Made By:月子 QQ：562888025
"<<endl;
cout<<"***************************************************************************
"<<endl;
cout<<" 1.Read From File 2.Print All List member"<<endl;
cout<<" 3.Search List member 4.Insert List member"<<endl;
cout<<" 5.Modify List member 6.Delete List member"<<endl;
cout<<" 7.Save To File 0.Exit System"<<endl;
cout<<"***************************************************************************
"<<endl;
cout<<"Please input a number above!"<<endl;
int i;
start:
cin>>i;
switch(i)
{
case 1:L.ReadFromFile(L);break;
case 2:L.PrintAll(L); break;
case 3:L.Search_Listmember(L);break;
case 4:L.InsertMember(L);break;
case 5:L.ModifyMember(L);break;
case 6:L.DelMember(L);break;
case 7:L.SavetoFile(L);break;
case 0:exit(1);break;
default:
{
cout<<"Error,please put a number again!"<<endl;
goto start; break;
}
}
}
void StuInfor::ReadFromFile(StuInfor &L)
{
system("cls"); //清屏
Open_flag=true;
ifstream filein;
filein.open("StuInfo.txt",ios_base::in); //输入流打开文件
if (!filein) //判断是否打开成功
{
cerr<<"
open error!"<<endl;
exit(1);
}
// cout<<setw(2)<<"次序"<<setw(8)<<" 学号"<<setw(5)<<" 姓名" //表头信息
// <<setw(6)<<" 数学成绩"<<setw(6)<<" 语文成绩"<<setw(6)
// <<" 英语成绩"<<setw(6)<<" 总分"<<" 总分排名"<<" 备注"<<endl;
// cout<<"****************************************************************************"<<endl;
for (int i=0;!filein.eof();i++) //遍历文件中的元素
{
filein>>stu[i].S_Position>>stu[i].S_Number>>stu[i].S_Name>>
stu[i].S_Score_Chinese >>stu[i].S_Score_Math>>stu[i].S_Score_English;
stu[i].S_Score_Totle=stu[i].S_Score_Chinese +stu[i].S_Score_Math+stu[i].S_Score_English;
// cout<<setw(2)<<stu[i].S_Position<<setw(13)<<stu[i].S_Number<<setw(6)<<stu[i].S_Name //输出所有信息
// <<setw(10)<<stu[i].S_Score_Chinese<<setw(10)<<stu[i].S_Score_Math<<setw(10)
// <<stu[i].S_Score_English<<setw(10)<<stu[i].S_Score_Totle<<stu[i].S_Rank<<endl;
Record=i;
}
cout<<" The Loading Finished！You can make other operations now!"<<endl;
filein.close(); //关闭文件
char temp; //临时定义用于输入的变量
cout<<"Continue to run the system?(y/n)"<<endl;
cin>>temp;
if (temp=='y')
{
L.Cmenu(L); //返回主菜单
}
else
exit(1);
}
void StuInfor::PrintAll(StuInfor &L)
{
system("cls");
char _load_temp='n';
if (!Open_flag)
{
cout<<"File hasn't loaded,and now load it?(y/n)"<<endl;
cin>>_load_temp;
if (_load_temp=='y')
{
L.ReadFromFile(L); //加载文件
}
else
L.Cmenu(L); //返回主菜单
}
cout<<setw(2)<<"次序"<<setw(8)<<" 学号"<<setw(5)<<" 姓名" //表头信息
<<setw(6)<<" 数学成绩"<<setw(6)<<" 语文成绩"<<setw(6)
<<" 英语成绩"<<setw(6)<<" 总分"<<" 总分排名"<<" 备注"<<endl;
cout<<"****************************************************************************"<<endl;
for (int i=0;i<=Record;i++) //遍历文件中的元素
{
stu[i].S_Score_Totle=stu[i].S_Score_Chinese +stu[i].S_Score_Math+stu[i].S_Score_English;
cout<<setw(2)<<stu[i].S_Position<<setw(13)<<stu[i].S_Number<<setw(6)<<stu[i].S_Name //输出所有信息
<<setw(10)<<stu[i].S_Score_Chinese<<setw(10)<<stu[i].S_Score_Math<<setw(10)
<<stu[i].S_Score_English<<setw(10)<<stu[i].S_Score_Totle<<stu[i].S_Rank<<endl;
}
cout<<" The Print Finished！"<<endl;
char temp; //临时定义用于输入的变量
cout<<"Continue to run the system?(y/n)"<<endl;
cin>>temp;
if (temp=='y')
{
L.Cmenu(L); //返回主菜单
}
else
exit(1);
}
void StuInfor::ModifyMember(StuInfor &L)
{
system("cls");
char _load_temp='n';
if (!Open_flag)
{
cout<<"File hasn't loaded,and now load it?(y/n)"<<endl;
cin>>_load_temp;
if (_load_temp=='y')
{
L.ReadFromFile(L); //加载文件
}
else
L.Cmenu(L); //返回主菜单
}
cout<<" Your position is at Modify list member Function!"<<endl;
int _Position;
cout<<"Please input the Position you want to Modify!"<<endl;
cin>>_Position;
int flag=1; //标识，用来标识是否找到要找的东西
char f,p;
for (int i=0;i<=Record;i++) //遍历文件中的信息
{
if(_Position==stu[i].S_Position) //以位置查找并打印查找到的东西
{
cout<<"What you want is:"<<endl; //打印出查找出来的东西
cout<<setw(2)<<"次序"<<setw(8)<<" 学号"<<setw(5)<<" 姓名" //表头信息
<<setw(6)<<" 数学成绩"<<setw(6)<<" 语文成绩"<<setw(6)
<<" 英语成绩"<<setw(6)<<" 总分"<<" 总分排名"<<" 备注"<<endl;
cout<<"****************************************************************************"<<endl;
cout<<setw(2)<<stu[i].S_Position<<setw(13)<<stu[i].S_Number<<setw(6)<<stu[i].S_Name //输出所有信息
<<setw(10)<<stu[i].S_Score_Chinese<<setw(10)<<stu[i].S_Score_Math<<setw(10)
<<stu[i].S_Score_English<<setw(10)<<stu[i].S_Score_Totle<<stu[i].S_Rank<<endl;
flag=0;
}
}
if(flag) //没有找到要找的元素，询问是否退出系统
{
cout<<"No find your position！
"<<endl;
cout<<"Continue to run the system?(y/n)"<<endl;
cin>>p;
if (p=='y')
{
L.Cmenu(L);
}
else
exit(1);
}
else //找到了要找的元素，可以进行操作了
{
cout<<"Do you want to Modify it?(y/n)"<<endl; //确认修改
cin>>f;
if (f=='y')
{
i=_Position-1; //逐项修改选中元素
cout<<"Now Please In put the new data!"<<endl;
cout<<"Input The new Number："<<endl;
cin>>stu[i].S_Number;
cout<<"Input The new Name："<<endl;
cin>>stu[i].S_Name;
cout<<"Input The new Chinese score："<<endl;
cin>>stu[i].S_Score_Chinese;
cout<<"Input The new Math score："<<endl;
cin>>stu[i].S_Score_Math;
cout<<"Input The new English score："<<endl;
cin>>stu[i].S_Score_English;
cout<<"Succeed to Modify the data!
And do not forget to save befor leave!"<<endl;
}
else
{
cout<<"Failed to modify!"<<endl;
}
cout<<"Continue to run the system?(y/n)"<<endl; //是否继续操作系统
cin>>p;
if (p=='y')
{
L.Cmenu(L); //返回主菜单
}
else
exit(1);
}
}
void StuInfor::Search_Listmember(StuInfor &L)
{
system("cls");
char _load_temp='n';
if (!Open_flag)
{
cout<<"File hasn't loaded,and now load it?(y/n)"<<endl;
cin>>_load_temp;
if (_load_temp=='y')
{
L.ReadFromFile(L); //加载文件
}
else
L.Cmenu(L); //返回主菜单
}
system("cls");
cout<<" Your position is Serach Function!"<<endl;
cout<<"What would you like to sesrch on?"<<endl;
cout<<" 1.On Name 2 On Number 3 Quit Search"<<endl;
int i;
P_S_start:
cin>>i;
switch(i) //选择函数，按姓名查找或者按照学号查找
{
case 1: L.Search_On_Name(L); break;
case 2: L.Search_On_Number(L); break;
case 3: L.Cmenu(L);break;
case 0: exit(1);break;
default:cout<<"Wrong input!
Put a number again!"<<endl;goto P_S_start;break;
}
L.Cmenu(L);
}
void StuInfor::Search_On_Name(StuInfor &L)
{
system("cls");
string _Name;
cout<<" Your position is Serach on Name Function!"<<endl;
cout<<"Please input the Name you want!"<<endl;
int flag=1; //标识，用来标识是否找到要找的东西
cin>>_Name;
for (int i=0;i<=Record;i++) //遍历文件中的元素
{
if(_Name==stu[i].S_Name) //以学号查找并打印查找到的东西
{
cout<<"What you want is:"<<endl;
cout<<setw(2)<<"次序"<<setw(8)<<" 学号"<<setw(5)<<" 姓名" //表头信息
<<setw(6)<<" 数学成绩"<<setw(6)<<" 语文成绩"<<setw(6)
<<" 英语成绩"<<setw(6)<<" 总分"<<" 总分排名"<<" 备注"<<endl;
cout<<"****************************************************************************"<<endl;
cout<<setw(2)<<stu[i].S_Position<<setw(13)<<stu[i].S_Number<<setw(6)<<stu[i].S_Name //输出所有信息
<<setw(10)<<stu[i].S_Score_Chinese<<setw(10)<<stu[i].S_Score_Math<<setw(10)
<<stu[i].S_Score_English<<setw(10)<<stu[i].S_Score_Totle<<stu[i].S_Rank<<endl;
flag=0;
break;
}
}
if(flag) //没有找到要找的元素，询问是否退出系统
{
cout<<"No find the number you want！"<<endl;
}
char p;
cout<<"Continue to run the system?(y/n)"<<endl; //是否继续操作系统
cin>>p;
if (p=='y')
{
L.Cmenu(L);
}
else
exit(1);
}
void StuInfor::Search_On_Number(StuInfor &L)
{
system("cls");
string _Number;
cout<<" Your position is Serach on Number Function!"<<endl;
cout<<"Please input the Number you want!"<<endl;
int flag=1; //标识，用来标识是否找到要找的东西
cin>>_Number;
for (int i=0;i<=Record;i++) //遍历文件中的元素
{
if(_Number==stu[i].S_Number) //以学号查找并打印查找到的东西
{
cout<<"What you want is:"<<endl;
cout<<setw(2)<<"次序"<<setw(8)<<" 学号"<<setw(5)<<" 姓名" //表头信息
<<setw(6)<<" 数学成绩"<<setw(6)<<" 语文成绩"<<setw(6)
<<" 英语成绩"<<setw(6)<<" 总分"<<" 总分排名"<<" 备注"<<endl;
cout<<"****************************************************************************"<<endl;
cout<<setw(2)<<stu[i].S_Position<<setw(13)<<stu[i].S_Number<<setw(6)<<stu[i].S_Name //输出所有信息
<<setw(10)<<stu[i].S_Score_Chinese<<setw(10)<<stu[i].S_Score_Math<<setw(10)
<<stu[i].S_Score_English<<setw(10)<<stu[i].S_Score_Totle<<stu[i].S_Rank<<endl;
flag=0;
break;
}
}
if(flag) //没有找到要找的元素，询问是否退出系统
{
cout<<"No find the number you want！"<<endl;
}
char p;
cout<<"Continue to run the system?(y/n)"<<endl; //是否继续操作系统
cin>>p;
if (p=='y')
{
L.Cmenu(L);
}
else
exit(1);
}
void StuInfor::DelMember(StuInfor &L)
{
system("cls");
char _load_temp='n';
if (!Open_flag)
{
cout<<"File hasn't loaded,and now load it?(y/n)"<<endl;
cin>>_load_temp;
if (_load_temp=='y')
{
L.ReadFromFile(L); //加载文件
}
else
L.Cmenu(L); //返回主菜单
}
cout<<" Your position is Delete list member Function!"<<endl;
int _Position; //定义一个位置，用于输入
int k;
cout<<"Please input the Position you want to Delete!"<<endl;
cin>>_Position;
char f,p;
int flag=1; //标识，用来标识是否找到要找的东西
for (int i=0;i<=Record;i++)
{
if(_Position==stu[i].S_Position) //以位置查找并打印查找到的东西
{
k=i;
flag=0;
cout<<"What you want to delete is:"<<endl;
cout<<setw(2)<<"次序"<<setw(8)<<" 学号"<<setw(5)<<" 姓名" //表头信息
<<setw(6)<<" 数学成绩"<<setw(6)<<" 语文成绩"<<setw(6)
<<" 英语成绩"<<setw(6)<<" 总分"<<" 总分排名"<<" 备注"<<endl;
cout<<"****************************************************************************"<<endl;
cout<<setw(2)<<stu[i].S_Position<<setw(13)<<stu[i].S_Number<<setw(6)<<stu[i].S_Name //输出所有信息
<<setw(10)<<stu[i].S_Score_Chinese<<setw(10)<<stu[i].S_Score_Math<<setw(10)
<<stu[i].S_Score_English<<setw(10)<<stu[i].S_Score_Totle<<stu[i].S_Rank<<endl;
cout<<"Now Delete it!(y/n)"<<endl;
break;
}
}
cin>>f;
if(flag) //没有找到要找的元素，询问是否退出系统
{
cout<<"No find your position!"<<endl;
cout<<"Continue to run the system?(y/n)"<<endl;
cin>>p;
if (p=='y')
{
L.Cmenu(L); //返回主菜单
}
else
exit(1);
}
else //找到了元素，可以进行操作了
{
if (f=='y')
{
for (i=_Position-1;i<k;i++)
{
stu[i]=stu[i+1];
stu[i].S_Position--; //使位置自动更改
}
Record--;
cout<<"You succeed to Delete it!
And do not forget to save befor leave!"<<endl;
}
else
cout<<"Failed to Delete it"<<endl;
}
cout<<"Continue to run the system?(y/n)"<<endl; //是否继续操作系统
cin>>p;
if (p=='y')
{
L.Cmenu(L);
}
else
exit(1);
}
void StuInfor::InsertMember(StuInfor &L)
{
system("cls");
char _load_temp='n';
if (!Open_flag)
{
cout<<"File hasn't loaded,and now load it?(y/n)"<<endl;
cin>>_load_temp;
if (_load_temp=='y')
{
L.ReadFromFile(L); //加载文件
}
else
L.Cmenu(L); //返回主菜单
}
cout<<" Your position is at Insert list member Function!"<<endl;
int _Position;
cout<<"Please input the Position you want to insert element!"<<endl;
cin>>_Position;
char f,p;
int flag=1; //标识，用来标识是否找到要找的东西
int k;
for (int i=0;i<=Record;i++) //以位置查找并打印查找到的东西
{
if(_Position==stu[i].S_Position)
{
flag=0;
cout<<setw(2)<<"次序"<<setw(8)<<" 学号"<<setw(5)<<" 姓名" //表头信息
<<setw(6)<<" 数学成绩"<<setw(6)<<" 语文成绩"<<setw(6)
<<" 英语成绩"<<setw(6)<<" 总分"<<" 总分排名"<<" 备注"<<endl;
cout<<"****************************************************************************"<<endl;
cout<<setw(2)<<stu[i].S_Position<<setw(13)<<stu[i].S_Number<<setw(6)<<stu[i].S_Name //输出所有信息
<<setw(10)<<stu[i].S_Score_Chinese<<setw(10)<<stu[i].S_Score_Math<<setw(10)
<<stu[i].S_Score_English<<setw(10)<<stu[i].S_Score_Totle<<stu[i].S_Rank<<endl;
}
}
k=i;
if(flag) //没有找到要找的元素，询问是否退出系统
{
cout<<"No find your position！
"<<endl;
cout<<"Continue to run the system?(y/n)"<<endl; //是否继续操作系统
cin>>p;
if (p=='y')
{
L.Cmenu(L);
}
else
exit(1);
}
else //找到了要找的元素，可以进行操作了
{
cout<<"Now Insert an element to this position!(y/n)"<<endl;
cin>>f;
if (f=='y')
{
for(i++;i>=_Position;i--)
{
stu[i]=stu[i-1]; //插入位置后边的元素后移一位
stu[i].S_Position++; //位置加1
}
// stu[k].S_Position--;
Record++;
cout<<"Now Please Input the element data："<<endl;
cout<<"Input The Number："<<endl;
cin>>stu[i].S_Number;
cout<<"Input The Name："<<endl;
cin>>stu[i].S_Name;
cout<<"Input The S_Score_Chinese："<<endl;
cin>>stu[i].S_Score_Chinese;
cout<<"Input The S_Score_Math："<<endl;
cin>>stu[i].S_Score_Math;
cout<<"Input The S_Score_English："<<endl;
cin>>stu[i].S_Score_English;
cout<<"You succeed to insert an element to the position!
And do not forget to save befor leave!"<<_Position<<"!"<<endl;
}
else
cout<<"Failed to insert !"<<endl;
cout<<"Continue to run the system?(y/n)"<<endl; //是否继续操作系统
cin>>p;
if (p=='y')
{
L.Cmenu(L);
}
else
exit(1);
}
}
void StuInfor::SavetoFile(StuInfor &L)
{
system("cls");
char p;
char _load_temp='n';
if (!Open_flag)
{
cout<<"File hasn't loaded,and now load it?(y/n)"<<endl;
cin>>_load_temp;
if (_load_temp=='y')
{
L.ReadFromFile(L); //加载文件
}
else
L.Cmenu(L); //返回主菜单
}
ofstream ofile;
ofile.open("StuInfo.txt",ios_base::out);
for (int i=0;i<=Record;i++) //保存到文件中
{
ofile<<stu[i].S_Position<<' '<<stu[i].S_Number<<' '<<stu[i].S_Name<<' '<<
stu[i].S_Score_Chinese<<' '<<stu[i].S_Score_Math<<' '<<stu[i].S_Score_English<<endl;
}
ofile.close();
cout<<"Succeed to save!"<<endl;
cout<<"Continue to run the system?(y/n)"<<endl; //是否继续操作系统
cin>>p;
if (p=='y')
{
L.Cmenu(L);
}
else
exit(1);
}
int main()
{
StuInfor L;
L.Cmenu(L);
return 1;
}
正确程序如下：
#include<iostream.h>
#include<string.h>
class Student
{
public:
Student (char name1[]="",int a=0)
{
strcpy(name,name1);
ach=a;
}
void print()
{
cout<<name<<ach<<endl;
}
int getAch(){
return ach;
}
private:
int ach;
char name[20];
};
void main()
{
int i,max;
Student stu[5]={Student("A",95),Student("B",97),Student("C",94),Student("D",98),Student("E",99)};
for(i=0;i<4;i++)
{
if (stu[i].getAch()>stu[i+1].getAch())
max=i;
else
max=i+1;
}
stu[max].print();
}
cokac
162
qixp
749
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班荷来适： 程序设计如下:#include<iostream>using namespace std;typedef struct student{ int score; char name[10];}student;int main(){ student stu[5]; strcpy(stu[0].name , ＂小明＂); stu[0].score = 50; strcpy(stu[1].name , ＂小江＂); stu[1].score = 60; strcpy...
丛台区17857593153： 数制转换问题 C++【系统任务】任意给定一个M进制的数x ,请实现如下要求1)求出此数x的10进制值(用MD表示)2)实现对x向任意的一个非M进制的数的... - ？
班荷来适：[答案] #include #include #include #include using namespace std; char stack[100]; int top=-1; void push(char data) { stack[++top]=data; stack[top+1]='\0'; } char *convert(int a,int b) { char *ch=new char[100]; char *ch1=new char[100]; int i=0,j,k=0; while(a) { int t=a...
丛台区17857593153： 用C++实现以下要求:？
班荷来适： #include<iostream> using namespace std; void main() { int i,k,count=0; cout<<＂Input a number:＂; do{ cin>>i; if(i<0) cout<<＂你输入的数字不合法!请重新输入!＂<<endl; }while(i>10000||i<0); do{ k=i%10; //对i进行...
丛台区17857593153： 用C++语言按下列要求编程 - ？
班荷来适： class Rectangle { protected:double width; double length; public:Rectangle(double width,double length) { this.width=width; this.length=length; } double Circum() { return width*2+length*2; } double Area() { return width*length; } void setWidth(double width)...
丛台区17857593153： C++编程实现一个TIME类,要求: - ？
班荷来适： #include<stdio.h> class TIME { private:int hour;int min;int sec; public:// 默认参数构造函数TIME(int h=0, int m=0, int s=0) {if (h>23 || h<0 || m>59 || m<0 || s>59 || s<0) {// 参数非法,默认为0点hour = 0;min = 0;sec = 0;return;}hour = h;...
丛台区17857593153： 按下列要求建立单链表,编写程序的实现.要用C++编写. - ？
班荷来适： typedef struct node{char data[10];//定义结点的数据域为字符串struct node *next; //结点的指针域 }ListNode, *LinkList; typedef struct nodetotal{int count;//定义结点的数量struct node *next; //首个结点的指针 }NodeTotal, *SList;(1)按头插入...
丛台区17857593153： c++基础实践,编写程序,按照下面的要求实现:定义整型数组a[10],从键盘输入10个数为数组赋值 - ？
班荷来适： #include ＂stdio.h＂ #define N 10 void print(int b[]){int i;for(i=0;i<N;printf(＂%d ＂,b[i++]));printf(＂\n＂); } void sort(int b[],int n){int i,j,k;for(i=0;i<n;i++){for(k=i,j=k+1;j<n;j++)if(b[k]>b[j])k=j;if(k-i)j=b[k],b[k]=b[i],b[i]=j;} } int main(int argc,char *...
丛台区17857593153： 关于C++数的计数问题(递归问题)我们要求找出具有下列性质数的个数(包含输入的自然数n):先输入一个自然数n(n≤1000),然后对此自然数按照如下方... - ？
班荷来适：[答案] 你的递归函数没有看太明白. 我写了一个,仅供参考: int js(int x) { int h=0,i; if(x==1) { return 1; } else { h =1; for(i=1;i
