一、

1.graph.h

class Graph{public:          //公共端接口    Graph (char ch, int n);     //构造函数    void draw();      //绘制图形private:     //私有端接口    char symbol;    int  size;};

2.graph.cpp

// 类graph的实现 #include "graph.h" #include 
     
      using namespace std;// 带参数的构造函数的实现 Graph::Graph(char ch, int n): symbol(ch), size(n) {}// 成员函数draw()的实现// 功能：绘制size行，显示字符为symbol的指定图形样式 //       size和symbol是类Graph的私有成员数据 void Graph::draw() {    for (int i=1;i<=size;i++)    {        for(int j=size-i-1;j>=0;j--)        {            cout<<" ";}for (int j=1;j<=i*2-1;j++){    cout<
      
       <
      
     

3.main.cpp

#include 
     
      #include "graph.h"using namespace std;int main() {    Graph graph1('*',5), graph2('$',7) ;  // 定义Graph类对象graph1, graph2     graph1.draw(); // 通过对象graph1调用公共接口draw()在屏幕上绘制图形     graph2.draw(); // 通过对象graph2调用公共接口draw()在屏幕上绘制图形        return 0; }
     

 

 

 

运行结果

 

 

 

二、

1.Fraction.h

class Fraction{public:    Fraction();                       //构造函数    Fraction(int i,int j);            //函数的重载    Fraction (int i);                 //函数的重载 void show();                         //输出    void addition(Fraction &a);       //加法函数    void minus(Fraction &a);          //减法函数    void multiply(Fraction &a);       //乘法    void divide(Fraction &a);         //除法    void compare(Fraction &a);        //比较private:    int top;        //分子    int bottom;     //分母}；

2.Fraction.cpp

#include 
     
      using namespace std;Fraction::Fraction():top=0, bottom=1 {}                //构造函数        Fraction::Fraction(int t0):top=t0, bottom=1 {}         //重载         Fraction::Fraction(int t0,int b0):top=t0, bottom=b0{}  //重载 void         void Fraction::addition(Fraction &a){    Fraction b;    b.top = top * a.bottom + a.top*bottom;    b.bottom = bottom * a.bottom;    b.show();}                                                       //加void Fraction::minus(Fraction &a){    Fraction b;    b.top = top * a.bottom - a.top*bottom;    b.bottom = bottom * a.bottom;    b.show();}                                                        //减void Fraction::multiply(Fraction &f1){    Fraction f2;    f2.top =top*f1.top;    f2.bottom =bottom*f1.bottom;    f2.show();}                                                        //乘void Fraction::divide(Fraction &a) {    Fraction b;    b.top =top*a.bottom;    b.bottom = bottom *a.top;    b.show();}                                                         //除void Fraction::compare(Fraction &a) {    Fraction b;    b.top = top * a.bottom - a.top*bottom;    b.bottom = bottom * a.bottom;    if(b.bottom*b.top > 0){        cout << top << "/" << bottom << ">" <
      
       << "/" << a.bottom <
      
     

3.main.cpp

#include 
     
      #include "Fraction.h"using namespace std;int main() {    Fraction a;    Fraction b(3,4);    Fraction c(5);    a.show();    b.show();    c.show();    c.addition(b);    c.minus(b);    c.multiply(b);    c.divide(b);    c.compare(b);    return 0;}