大二上学期期末C++课程设计

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题目一矩阵运算

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#include<iostream>
using namespace std;

class Matrix
{
private:
	int a[2][2];
	int b[2][2];
	int result[2][2];

public:
	Matrix();
	void add();
	void subtraction();
	void multiplication();
	void division();
	void transpose();
};
Matrix::Matrix()
{

    a[2][2]=0;
	b[2][2]=0;
	result[2][2]=0;
	cout<<"请输入矩阵A:"<<endl;
	int i,j;
	for (i = 0; i < 2; ++i)
		for (j = 0; j < 2; ++j)
		{
			cin>>a[i][j];

		}
	cout<<"请输入矩阵B:"<<endl;
	for (i = 0; i < 2; ++i)

		for (j = 0; j < 2; ++j)
		{
			cin>>b[i][j];

		}
	cout<<"你输入的矩阵A为"<<endl;
		for (i = 0; i < 2; ++i){
			for (j = 0; j < 2; ++j)
			{
			cout<<a[i][j]<<" ";

			}cout<<endl;
		}
	cout<<endl<<"你输入的矩阵B为"<<endl;
	for (i = 0; i < 2; ++i)
	{
		for (j = 0; j < 2; ++j)
		{
			cout<<b[i][j]<<" ";

		}cout<<endl;
	}

}
void Matrix::add()
{
	int i,j;
	cout<<"相加结果为"<<endl;
	for(i=0;i<2;++i)
	{
		for(j=0;j<2;++j)
		{
			result[i][j] = a[i][j]+b[i][j];
			cout<<result[i][j]<<" ";
		}cout<<endl;
	}

}
void Matrix::subtraction()
{
	int i,j;
	cout<<"相加结果为"<<endl;
	for(i=0;i<2;++i)
	{
		for(j=0;j<2;++j)
		{
			result[i][j] = a[i][j]-b[i][j];
			cout<<result[i][j]<<" ";
		}cout<<endl;
	}

}
void Matrix::multiplication()
{
		for(int i=0;i<2;i++)
	{
		for(int j=0;j<2;j++)
		{
			result[i][j] = a[i][j]*b[i][j] + a[i][j]*b[j][i];
			cout<<result[i][j]<<"  ";
		}cout<<endl;
	}

}
void Matrix::division()
{

}
void Matrix::transpose()
{
	int i,j;
	cout<<"A转置为:"<<endl;
	for(i=0;i<2;++i)
	{
		for(j=0;j<2;++j)
		{
			result[i][j]=a[j][i];
			cout<<result[i][j]<<" ";
		}cout<<endl;
	}

	cout<<"B转置为:"<<endl;
	for(i=0;i<2;++i)
	{
		for(j=0;j<2;++j)
		{
			result[i][j]=b[j][i];
			cout<<result[i][j]<<" ";
		}cout<<endl;
	}

}
int main()
{
	int h;
cout<<"-------------------"<<endl;
cout<<":        菜单      "<<endl;
cout<<":      1.加法      "<<endl;
cout<<":      2.减法      "<<endl;
cout<<":      3.乘法      "<<endl;
cout<<":      4.除法      "<<endl;
cout<<":      5.转置      "<<endl;
cout<<":      0.退出      "<<endl;
cout<<"-------------------"<<endl;
cout<<"请输入要进行的操作"<<endl;
cin >>h;
cout<<endl;
switch(h)
{
	case 1:
	{
	Matrix M;
	M.add();
	break;
	}
	case 2:
	{
	Matrix M;
	M.subtraction();
	break;
	}
	case 3:
	{
	Matrix M;
	M.multiplication();
	break;
	}
	case 4:
	{
	Matrix M;
	M.division();
	break;
	}
	case 5:
	{
	Matrix M;
	M.transpose();
	break;
	}
	case 0:
	{
	cout<<"退出成功";
	return 0;
	}
	default: cout<<"输入错误"<<endl;
}
}

题目二 求不同图形面积

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#include <bits/stdc++.h>
using namespace std;

class Graphic{
	public:
		string name;
		double length;
		double tall;
		Graphic(string s,double a,double b=0):name(s),length(a),tall(b){}
		virtual void show()=0;
};
class Square:public Graphic
{
public:
	Square(double a):Graphic("Square",a)
	{}
	void show(){
		cout<<"Square'area:"<<length*length<<endl;
	}


	// ~Square();
};
class Circle:public Graphic
{
public:
	Circle(double a):Graphic("Circle",a){}
	void show(){
		cout<<"Circle'area:"<<length*length*3.14<<endl;
	}
};
class triangle:public Graphic
{
public:
	triangle(double a,double b):Graphic("Circle",a,b){}
	void show(){
	    //double i
        //i =
		cout<<"triangle'area:"<<(length*tall)/2<<endl;
	}
};
int main()
{
	Graphic *gp;
	string type;  // 定义图形的类型
	double value;
	double tall;
	cout<<"what'type"<<endl;
	cin>>type;
	// cout<<"what'value"<<endl;
	// cin>>value;
	if(type=="Square")
	{
		cout<<"what'value"<<endl;
		cin>>value;
		gp = new Square(value);
		gp ->show();
	}
	if(type=="Circle")
	{
		cout<<"what'value"<<endl;
		cin>>value;
		gp = new Circle(value);
		gp ->show();
	}
	if(type=="triangle")
	{
		cout<<"what'value"<<endl;

		cin>>value;
		cout<<"what'tall"<<endl;
		cin>>tall;
		gp = new triangle(value,tall);
		gp ->show();
	}
}

题目三 运算符重载

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#include<iostream>
using namespace std;
class Complex{
public:
	Complex(double r=0.0,double i=0.0);
	void print();
	friend Complex operator+ (Complex& a,Complex& b);
	friend Complex operator- (Complex& a,Complex& b);
	friend Complex operator* (Complex& a,Complex& b);
	friend Complex operator/ (Complex& a,Complex& b);
private:
	double real;
	double imag;

};
Complex::Complex(double r,double i)
{
	real = r;
	imag = i;
}
Complex operator+ (Complex& a,Complex& b)
{
	Complex temp;
	temp.real = a.real + b.real;
	temp.imag = a.imag + a.imag;
	return temp;
}
Complex operator- (Complex& a,Complex& b)
{
	Complex temp;
	temp.real = a.real - b.real;
	temp.imag = a.imag - a.imag;
	return temp;
}
Complex operator* (Complex& a,Complex& b)
{
	Complex temp;
	temp.real = a.real * b.real + a.imag * b.imag;
	temp.imag = a.real * b.imag + a.imag * b.real;
	return temp;
}
Complex operator/ (Complex& a,Complex& b)
{
	Complex temp;
	double t;
	t = 1/(b.real * b.real + b.imag * b.imag);
	temp.real = (a.real * b.real + a.imag * b.imag)*t;
	temp.imag = (b.real * b.imag + a.imag * b.real)*t;
	return temp;
}
void Complex::print()
{
	cout<<real;
	if(imag>0)
		cout<<"+";
	if(imag!=0)
		cout<<imag<<'i'<<endl;
}
int main()
{
	Complex A1(2.3,4.6),A2(3.6,2.8),A3,A4,A5,A6;
	A3 = A1 + A2;
	A4 = A1 - A2;
	A5 = A1 * A2;
	A6 = A1 / A2;
	A1.print();
	A2.print();
	A3.print();
	A4.print();
	A5.print();
	A6.print();
	return 0;
}

学生管理系统

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#include<iostream>
#include<string>
#include<iomanip>
using namespace std;

int num;                                   //总学生人数

class student {
    friend class studentMessage; // 友员函数
private:
    string ID;
    string name;
    double score[5];                       //1-4代表math、English、OPP和总成绩  ，0号单元空出
    student * next;
public:
    student();
    string getName(){return name;}
    string getID(){return ID;}
    double getMath(){return score[1];}
    double getEnglesh(){return score[2];}
    double getOPP(){return score[3];}
    double gettotol(){return score[4];}
    student* getNext(){return next;}

    static void analyse(int ,student * ); //分析成绩
    void display();                          //打印成绩
    void swap();                          //交换对象和对象->next的信息
};

student::student()
{
    cout<<"请输入学生学号 : ";cin>>ID;
    cout<<"请输入学生姓名 : ";cin>>name;
    cout<<"请输入学生的数学、英语和OPP成绩 : "<<endl;
    int a,b,c;
    cin>>a;
    while(a<0||a>100)
    {
        cout<<"输入成绩有误，请重新输入: "<<endl;
        cin>>a;    
    }
    cin>>b;
    while(b<0||b>100)
    {
        cout<<"输入成绩有误，请重新输入: "<<endl;
        cin>>b;
    }
    cin>>c;
    while(c<0||c>100)
    {
        cout<<"输入成绩有误，请重新输入: "<<endl;
        cin>>c;        
    }
    score[1]=a;
    score[2]=b;
    score[3]=c;
    score[4]=a+b+c;
    next=NULL;
}

void student::analyse(int a,student * first)
{
    int you=0,liang=0,zhong=0,jige=0,bujige=0;
    student * t=first;
    double average=0;                   //平均分
    while(t)
    {
        int b = int(t->score[a]/10);
        switch(b)
        {
        case 10:
        case 9:you++;break;
        case 8:liang++;break;
        case 7:zhong++;break;
        case 6:jige++;break;
        default:bujige++;
        }
        average+=t->score[a];
        t=t->next;
    }
    average=average/num;
    cout<<" 考生总人数 : "<<num<<"        平均分 : "<<average<<endl;
    cout<<"\n 优     良      中     及格    不及格  "<<endl;
    cout<<" "<<you<<" \t"<<liang<<" \t"<<zhong<<"\t"<<jige<<"\t"<<bujige<<endl;
}

void student::display()
{
    cout<<" "<<setw(3)<<ID<<"     "<<setw(3)<<name<<"      ";
    for (int i=1;i<=4;i++)
    {
        cout<<setw(3)<<score[i]<<"      ";
    }
    cout<<endl;
}

void student::swap()
{
    int j;
    string na,id;
    double sco[5];
    na=name;name=next->name;next->name=na;
    id=ID;ID=next->ID;next->ID=id;
    for(j=1;j<=4;j++)
    {                                            
        sco[j]=score[j];
        score[j]=next->score[j];    
        next->score[j]=sco[j];
    }
}

class studentMessage{
private:
    student * first;
    student * last;
public:
    studentMessage();
    student* getFirst(){return first;}
    student* getLast(){return last;}
    int getNum(){return num;}
    void add();                             //向表中增加学生成绩记录
    void search();                          //在表中查找学生成绩记录
    void del();                             //在表中删除学生成绩记录
    void showOne();                         //分析一门课的成绩
    void showAll();                         //输出所有同学所有科目的成绩
    void sort();                            //按一门课成绩或总成绩排序
    void clear();                           //清空所有信息并退出系统

};

studentMessage::studentMessage()
{
    first=NULL;
    last=NULL;
    num=0;
}

void studentMessage::add()
{
    student * t =new student;
    student *p = first;
    while(p){
        if(p->ID==t->ID)
        {
            cout<<"\n学号输入错误或该学生成绩已经存在！(如需修改，请先删除再重新录入)"<<endl;
            return;
        }
        p=p->next;
    }
    num++;
    if(first==NULL)
    {
        first=last=t;

    }
    else
    {    
        last->next=t;
        last=last->next;
    }
}

void studentMessage::search()
{
    string a;
    cout<<"\n请输入要查找的学生的学号:";cin>>a;
    student *t = first;
    while(t){
        if(t->ID==a)
            break;
        t=t->next;
    }
    if(!t)
    {
        cout<<"\n未找到要查找学生！"<<endl;
        return;
    }
    cout<<"\n查找成功！"<<endl;
    cout << " 学号    姓名     数学     英语     OPP     总成绩" << endl;
    t->display();        
}

void studentMessage::del()    
{
    string a;
    cout<<"\n请输入要删除的学生的学号: ";cin>>a;
    student *t = first;
    student *p=NULL;
    while(t){
        if(t->ID==a)
            break;
        p=t;
        t=t->next;
    }
    if(!t)
    {
        cout<<"\n未找到要删除学生！"<<endl;
        return;
    }
    if(!p)
    {
        first=first->next;
        cout<<"\n成功删除学生"<<a<<endl;
        delete t;
    }
    else
    {
        p->next=t->next;
        cout<<"成功删除学生"<<a<<endl;
        delete t;
    }

    num--;
}

void studentMessage::showOne()
{
    int a;
    while(1)
    {
        cout<<"\n想要分析哪一门成绩？请输入相应序号(1:math 2:English 3:OPP):  ";cin>>a;
        if(a!=1&&a!=2&&a!=3)
            cout<<"\n输入序号有误，请重新输入！"<<endl;
        else
            break;
    }
    cout<<"\n\t成绩分析如下: \n"<<endl;
    student::analyse(a,first);
}

void studentMessage::showAll()
{
    cout << "---------------------成绩列表----------------------"<< endl;
    cout << " 学号    姓名     数学     英语     OPP     总成绩" << endl;
    student *t = first;
    while(t){
        t->display();
        t=t->next;
    }
}

void studentMessage::sort()
{
    int a,n=0;                  //n--排名
    cout<<"想要按照什么成绩排序？请输入相应序号(1.数学 2.英语 3.OPP 4.总成绩): ";
    while(1)
    {
        cin>>a;
        if (a!=1&&a!=2&&a!=3&&a!=4)
            cout<<"\n输入序号有误，请重新输入 : ";
        else
            break;
    }
    student *t=first;
    student *p=t;
    while(p->next)
    {
        t=first;
        while(t->next)
        {
            if(t->next->score[a]>=t->score[a])
            {
                t->swap();
            }
            t=t->next;
        }
        p=p->next;
    }
    t = first;
    cout<<"\n\t 成绩表如下: "<<endl;
    cout<<"学号    姓名    成绩    排名"<<endl;
    while(t){
        n++;
        cout<<" "<<t->getID()<<"  \t"<<t->getName()<<"  \t";
        switch(a)
        {
            case 1 :cout<<t->getMath()<<"  \t"<<n<<endl;break;
            case 2 :cout<<t->getEnglesh()<<"  \t"<<n<<endl;break;
            case 3 :cout<<t->getOPP()<<"  \t"<<n<<endl;break;
            case 4 :cout<<t->gettotol()<<"  \t"<<n<<endl;break;
        }
        t=t->next;    
    }
}

void studentMessage::clear()
{
    int x;
    cout<<"确认要清空所有信息？请输入1或2 (1:确认 2:取消) : ";cin>>x;
    if (x==2)
    {
        cout<<"\n取消清空\n"<<endl;
        return;
    }
    student *t = first;
    student *p;
    while(t){
        p=t;
        t=t->next;
        delete p;
    }
    cout<<"\n清空成功！\n";
    cout<<"退出成功！\n";
}

void showMenu()
{
    cout << "                               \n";
    cout << "===============================\n";
    cout << "      学生成绩管理系统\n\n";
    cout << "      1.显示所有学生成绩\n";
    cout << "      2.添加信息\n";
    cout << "      3.查询信息\n";
    cout << "      4.删除信息\n";
    cout << "      5.成绩排序\n";
    cout << "      6.单科成绩分析\n";
    cout << "      7.清空所有信息并退出系统\n";
    cout << "      0.退出系统\n";
    cout << "===============================\n";
    cout << "                               \n";
}

int main()
{
    int h;
    studentMessage stuM=studentMessage();
    while(1)
    {
        showMenu();
        cout << "请输入操作对应的序号 : ";
        cin >>h;
        cout<<endl;
        switch(h)
        {
            case 1: stuM.showAll(); break;
            case 2: stuM.add(); break;
            case 3: stuM.search(); break;
            case 4: stuM.del(); break;
            case 5: stuM.sort(); break;
            case 6: stuM.showOne(); break;
            case 7: stuM.clear(); return 0;
            case 0: cout<<"\n退出成功！";return 0;
            default:cout<<"\n输入序号有误！请输入正确的序号。"<<endl;
        }
    }
}