C++ 实验三

part2

#ifndef GRAPH_H
#define GRAPH_H

// 类Graph的声明 
class Graph {
public:
    Graph(char ch, int n);   // 带有参数的构造函数 
    void draw();     // 绘制图形 
private:
    char symbol;
    int size;
};


#endif

Graph.h

#include "graph.h"
#include <iostream>
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
void Graph::draw() {
    int line, j, k;
    for (line=1;line<= size;line++)
    {
        for (j=1; j<=size-line;j++)
            cout << " ";
        for (k=1;k<=2*line-1;k++)
            cout<<symbol;
        cout<<endl;
    }
}

Graph.cpp

#include <iostream>
#include "graph.h"
using namespace std;
int main() {
    Graph graph1('*', 5);
    graph1.draw();
    system("pause");
    Graph graph2('$', 7);
    graph2.draw();
    system("pause");
    return 0;
}

main.cpp

part3

基于需求描述设计、定义并实现分数类Fraction,并编写代码完成测试。 具体要求如下: 设计一个分数类 Fraction描述分数(两个整数的比值)

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

int main() {
    Fraction a;
    a.show();
    Fraction b(3, 4);
    b.show();
    Fraction c(5);
    c.show();
    int x, y;
    cin >> x >> y;
    Fraction d(x, y);
    a.plus(b, d);
    a.minus(b, d);
    a.times(b, d);
    a.divide(b, d);
    a.compare(b, d);

    system("pause");
}

main.cpp

#include"fraction.h"
#include<iostream>
using namespace std;
void Fraction::show() {
    if (top == 0) cout << 0 << endl;
    else if (bottom == 1) cout << top << endl;
    else if (top / bottom < 0) cout << "-" << top << "/" << bottom << endl;
    else cout << top << "/" << bottom << endl;
}

void Fraction::plus(Fraction &a, Fraction &b) {
    int t1, b1, t2, b2, m, n, temp, x, y, i;
    t1 = a.top;
    t2 = b.top;
    b1 = a.bottom;
    b2 = b.bottom;
    y = b1 * b2;
    x = t1 * b2 + t2 * b1;
    m = x;
    n = y;
    if (m < n)
    {
        temp = m;
        m = n;
        n = temp;
    }
    for (i = n; i >= 1; i--)
    {
        if (x%i == 0 && y%i == 0) break;
    }
    x = x / i;
    y = y / i;
    cout << x << "/" << y << endl;
}

void Fraction::minus(Fraction &a, Fraction &b) {
    int t1, t2, b1, b2, x, y, m, n, temp, i;
    t1 = a.top;
    t2 = b.top;
    b1 = a.bottom;
    b2 = b.bottom;
    y = b1 * b2;
    x = t1 * b2 - t2 * b1;
    m = x;
    n = y;
    if (m < n)
    {
        temp = m;
        m = n;
        n = temp;
    }
    for (i = n; i >= 1; i--)
    {
        if (x%i == 0 && y%i == 0) break;
    }
    x = x / i;
    y = y / i;
    cout << x << "/" << y << endl;
}

void Fraction::times(Fraction &a, Fraction &b) {
    int t1, t2, b1, b2, x, y, m, n, temp, i;
    t1 = a.top;
    t2 = b.top;
    b1 = a.bottom;
    b2 = b.bottom;
    y = b1 * b2;
    x = t1 * t2;
    m = x;
    n = y;
    if (m < n)
    {
        temp = m;
        m = n;
        n = temp;
    }
    for (i = n; i >= 1; i--)
    {
        if (x%i == 0 && y%i == 0) break;
    }
    x = x / i;
    y = y / i;
    cout << x << "/" << y << endl;
}

void Fraction::divide(Fraction &a, Fraction &b) {
    int t1, t2, b1, b2, x, y, m, n, temp, i;
    t1 = a.top;
    t2 = b.top;
    b1 = a.bottom;
    b2 = b.bottom;
    y = b1 * t2;
    x = t1 * b2;
    m = x;
    n = y;
    if (m < n)
    {
        temp = m;
        m = n;
        n = temp;
    }
    for (i = n; i >= 1; i--)
    {
        if (x%i == 0 && y%i == 0) break;
    }
    x = x / i;
    y = y / i;
    cout << x << "/" << y << endl;
}

void Fraction::compare(Fraction &a, Fraction &b) {
    int t1, t2, b1, b2, x, y;
    t1 = a.top;
    t2 = b.top;
    b1 = a.bottom;
    b2 = b.bottom;
    y = b1 * b2;
    x = t1 * b2 - t2 * b1;
    if (x < 0) cout << a.top << "/" << a.bottom << "<" << b.top << "/" << b.bottom << endl;
    else if (x > 0) cout << a.top << "/" << a.bottom << ">" << b.top << "/" << b.bottom << endl;
    else if (x == 0) cout << a.top << "/" << a.bottom << "=" << b.top << "/" << b.bottom << endl;
}

fraction.cpp

#ifndef FRACTION_H
#define TRACTION_H
class Fraction
{
public:
    Fraction(int a = 0, int b = 1) :top(a), bottom(b) {}
    Fraction(const Fraction &a) :top(a.top), bottom(a.bottom) {}
    void plus(Fraction &x, Fraction &y);
    void minus(Fraction &x, Fraction &y);
    void times(Fraction &x, Fraction &y);
    void divide(Fraction &x, Fraction &y);
    void compare(Fraction &x, Fraction &y);
    void show();
private:
    int top;
    int bottom;
};
#endif

fraction.h

一开始第一题漏写了一个system("pause")，导致窗口闪了一下就消失了。后来检查后发现并解决了问题，以后写代码一定要细心，不要漏写这个少写那个。