char ch;
	cin.get(ch);
	cout << ch<<endl;
	cout.put(ch);
	getchar();//用來消除回車的
	cout << endl;
	//字符串的輸入輸出
	char str[20] = "";//要初始化不然會出現(xiàn)輸出后最后無/0導(dǎo)致輸出燙燙燙...
	cin.getline(str, 20);//這里更安全只能輸入20個 多了只取前面20個
	cout.write(str,20);

    int num = 10;
	cout << setbase(8) << num << endl;
	cout << setbase(10) << num << endl;
	cout << setbase(16) << num << endl;

int num = 10;
cout<< setfill('s')<<setw(8) << num;

	double num = 3.14159;
	cout << setprecision(4) << num << endl;
	cout << setprecision(4) << num * 10 << endl;

​stringstream s("sdflk");
	cout << s.str() << endl;
	s.str("ljsflk");
	s.str(string("sdljf"));
	//二種都可以 一個是構(gòu)建一個string的無名對象傳字符串
	cout << s.str() << endl;
 
​

將數(shù)字轉(zhuǎn)換為字符串
int num =1234；
cout<<to_string(num)<<endl//以字符串輸出num
stringstream stream;
stream << num;//將num流入stream這個類中
stream >> str;//stream流出到str這個字符串中
cout << str << endl;

stringstream stream;
	stream << num;//將num流入stream這個類中
	stream >> str;//stream流出到str這個字符串中
	cout << str << endl;
	string str2;
    //如果沒有clear函數(shù)就沒有把num流入到num2
	stream.clear();
	stream << num;
	stream >> str2;
	cout << str2 << endl;

	fstream File;
	File.open("1.tex", ios::in | ios::out | ios::trunc);
	if (！File.is_open())
	{
		cout << "創(chuàng)建文件失敗" << endl;
	}
	if (!File)
	{
		cout << "創(chuàng)建文件失敗" << endl;
	}

fstream Read("1.txt",ios::in);//讀的方式打開文件///要有這個文件
fstream Write("2.txt",ios::out|ios::trunc);
//寫的方式打開文件//沒有這個文件就創(chuàng)建一個
	while (1)
	{
		char ch;
		Read.get(ch);
		if (Read.eof())
		{
			break;
		}
		Write.put(ch);
	}
	Read.close();
	Write.close();

fstream read("1.txt", ios::in);
	read.seekg(5);//移動5個字節(jié)后
	char ch = read.get();//讀取5個位置后的第一個
	cout << ch << endl;

	fstream read("1.txt", ios::in);
	read.seekg(5);//移動5個字節(jié)后
	char ch = read.get();//讀取5個位置后的第一個
	cout << ch << endl;
	read.seekg(0, ios::beg);
	ch = read.get();
	cout << ch << endl;
	read.seekg(-5, ios::end);//最后位置前面5個
	ch = read.get();
	cout << ch << endl;