C++ 接口封装 调用

Keypad头文件

#pragma once
class Keypad
{
public:
	Keypad();
	int getInput()const;
	~Keypad();
};

Keypad源文件

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


Keypad::Keypad()
{
}

int Keypad::getInput() const
{	
	int input;
	Screen screen;
	screen.displayMessageLine("pls input amount:\t\n");
	cin >> input;
	return input;
}


Keypad::~Keypad()
{
}

输出 Screen

Screen头文件

#pragma once

using namespace std;
#include<string>
class Screen
{
public:
	Screen();
	void displayMessage(string)const;//输出消息
	void displayMessageLine(string)const;//换行输出消息
	void displayDollarAmount(double)const; // 输出金额
	~Screen();
};

screen源文件

#include "Screen.h"
#include<iostream>
#include<string>
#include<iomanip>
using namespace std;
Screen::Screen()
{
}

void Screen::displayMessage(string message) const
{
	cout << message;
}

void Screen::displayMessageLine(string message) const
{
	cout << message << endl;
}

void Screen::displayDollarAmount(double amount) const
{
	cout << fixed << setprecision(2) << "$" << amount;
}


Screen::~Screen()
{
}

驱动测试或者客户端测试

#include<iostream>
#include"Screen.h"
#include"Keypad.h"
#include<stdlib.h>
using namespace std;
int main() {
	Screen screen;
	Keypad keypad;
	
	screen.displayDollarAmount(keypad.getInput());
	putchar(10);
	
	screen.displayMessageLine("there is no choice but to grow!!");

	screen.displayMessage("hello world");
	system("pause");
}