7 章 01

// C++primer.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <iostream>
#include <string>
#include <vector>
using namespace std;
class Screen;
class Window_mgr
{
public:
	
	void clear();

};
class Screen {
	friend void Window_mgr::clear();
	unsigned height = 0, width = 0;
	unsigned cursor = 0;
	string contents;
public:
	Screen() = default;
	Screen(unsigned ht, unsigned wd) :height(ht), width(wd), contents(ht*wd, ' ') {}
	Screen(unsigned ht, unsigned wd, char c) :height(ht), width(wd), contents(ht*wd, c) {}

	Screen& move(unsigned r, unsigned c)
	{
		cursor = r*width + c;
		return *this;
	}
	Screen& set(char ch)
	{
		contents[cursor] = ch;
		return *this;
	}
	Screen& set(unsigned r, unsigned c, char ch)
	{
		contents[r*width + c] = ch;
		return *this;
	}
	Screen& display()
	{
		cout << contents;
		return *this;
	}
};

void Window_mgr::clear( ) 
{
	Screen myScreen(10, 20, 'X');
	cout << "Screen before clear:" << endl;
	cout << myScreen.contents << endl;
	myScreen.contents = " ";
	cout << "Screen after clear:" << endl;
	cout << myScreen.contents << endl;
}
int  main()
{
	Window_mgr w;
	w.clear();
	system("pause");
    return 0;
}
#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
using namespace std;
istream& istext(istream& in)
{
	int v;
	while (in >> v, !in.eof()) //直到遇到文件结束符号才停止读取
	{
		if (in.bad())
			throw runtime_error("IO流错误");
		if (in.fail()) 
		{
			cerr << "数据错误，请重试：" << endl;
			in.clear();
			in.ignore(100, '\n');
			continue;
		}
		cout << v << endl;
	}

	in.clear();
	return in;
}
int  main()
{
	string x;
	vector<string> vecStr;
	ifstream in("shader.vs");
	while (in >> x)
	{
		vecStr.push_back(x);
	}
	for (auto &vec : vecStr)
		cout << vec << endl;
	system("pause");
    return 0;
}
​