实验三

#ifndef GRAPH_H
#define GRAPH_H

class Graph {
    public:
        Graph(char ch, int n);   
        void draw();     
    private:
        char symbol;
        int size;
};


#endif

#include "graph.h" 
#include <iostream>
using namespace std;
 
Graph::Graph(char ch, int n): symbol(ch), size(n) {
}


void Graph::draw() {
    int i, j, k;
    for(i=1;i<=size;i++)
    {
        for (j = 1; j <= size - i; j++)
            cout << " ";
        for (k = 1; k <= 2 * i - 1; k++)
            cout << symbol;
        cout << endl;

    }
}

#include <iostream>
#include "graph.h"
using namespace std;

int main() {
    Graph graph1('*',5);
    graph1.draw();
    
    system("pause");
    system("cls");
    
    Graph graph2('$',7);
    graph2.draw();
    system("pause");
    
    return 0; 
} 

 

 

 3

#ifndef FRACTION_H
#define FRACTION_H

class Fraction {
public:
Fraction(int x = 0, int y = 1) : top(x), bottom(y) { if (bottom == 0) exit(0); };
void show();
void simplyFraction();
friend Fraction addf(Fraction &a,Fraction &b);
friend Fraction minf(Fraction &a,Fraction &b);
friend Fraction mulf(Fraction &a,Fraction &b);
friend Fraction divf(Fraction &a,Fraction &b);

private:
int top;
int bottom;
};

#endif

fraction.h

#include <iostream>
#include "fraction.h"
using namespace std;
void Fraction::show()
{
    if (bottom < 0) top = -top;
    if (top == 0)
        cout << 0 << endl;
    else if (bottom == 1)
        cout << top << endl;
    else
        cout << top << "/" << bottom << endl;
}
void Fraction::simplyFraction()
{
    int m=1;
    for (int i = 2;i <= top&&i <= bottom;i++)
    {
        if (top%i == 0 && bottom%i == 0) m = i;
    }
    top = top / m;
    bottom = bottom / m;
}
Fraction addf(Fraction &a, Fraction &b)
{
    Fraction aresult;
    aresult.top = a.top*b.bottom + b.top*a.bottom;
    aresult.bottom = a.bottom*b.bottom;
    aresult.simplyFraction();
    return aresult;
}
Fraction minf(Fraction &a, Fraction &b)
{
    Fraction minresult;
    minresult.top = a.top*b.bottom - b.top*a.bottom;
    minresult.bottom = a.bottom*b.bottom;
    minresult.simplyFraction();
    return minresult;
}
Fraction mulf(Fraction &a, Fraction &b)
{
    Fraction mulresult;
    mulresult.top = a.top*b.top;
    mulresult.bottom = a.bottom*b.bottom;
    mulresult.simplyFraction();
    return mulresult;
}
Fraction divf(Fraction &a, Fraction &b)
{
    Fraction dresult;
    dresult.top = a.top*b.bottom;
    dresult.bottom = a.bottom*b.top;
    dresult.simplyFraction();
    return dresult;
}

#include<iostream>
#include"fraction.h"
using namespace std;
int main()
{
    Fraction a;
    a.show();
    Fraction b(3, 4);
    b.show();
    Fraction c(5);
    c.show();
    addf(a, b).show();
    minf(a, c).show();
    mulf(b, c).show();
    divf(b, c).show();
    return 0;
}