127.字符串输入输出流

#include<iostream>
//用于字符串的输入输出
#include<sstream>
#include<cstdlib>
#include<string>
//用于输出到字符串
#include<strstream>
using namespace std;

void main1()
{
    //创建字符串流(sprintf)
    stringstream mystr;
    //输出
    mystr.put('X').put('Y');
    //相当于汇总一个字符串(sprintf)
    mystr << "1234" << 12.89 << 4;
    cout << mystr.str() << endl;

    //类似以下也可以调用
    //mystr.put  
    //mystr.write

    cin.get();
}

//创建结构体,从字符串中截取字符
struct info
{
    string str1;
    string str2;
    string str3;
    int num;
    char ch;
    double db;

};

void main2()
{
    //从字符串中获取数据,相当于sscanf,把数据截取到结构体中
    string str1("google microsoft  apple 100  A  10.9"); 
    //创建结构体
    info inf;
    //建立输入流(sscanf)
    istringstream iput(str1);
    //从输入流获取数据到结构体中
    iput >> inf.str1 >> inf.str2 >> inf.str3 >> inf.num >> inf.ch >> inf.db;
    //输出结构体信息
    cout << inf.str1 << "
" << inf.str2 << "
" << inf.str3 << "
" << inf.num << "
" << inf.ch << "
" << inf.db;

    //类似以下也可以调用
    //iput.gcount
    //iput.getline();


    cin.get();
}


void main123213()
{
    //切割数据
    char p[100] = "google ,microsoft , apple ,100 , A , 10.9";
    for (char *px = p; *px != ''; px++)
    {
        if (*px == ',')
        {
            *px = ' ';
        }
    }


    info inf;
    //建立输入流
    istringstream iput(p);

    iput >> inf.str1 >> inf.str2 >> inf.str3 >> inf.num >> inf.ch >> inf.db;//输入
    cout << inf.str1 << "
" << inf.str2 << "
" << inf.str3 << "
" << inf.num << "
" << inf.ch << "
" << inf.db;
    cin.get();
}

void main123123()
{
    char str[150] = { 0 };//当作缓冲区
    //建立输出流,写到str中
    ostringstream oput(str, sizeof(str));
    oput << "1233a" << 12.9 << 'A';
    //cout << oput.str() << endl;
    cout << str << endl;

    cin.get();
}

//另外一种方法 用到头文件 strstream
void main1232132()
{
    char str[150] = { 0 };//当作缓冲区
    //创建输出流,输出到缓冲区中     ostrstream在strstream头文件中
    ostrstream oput(str, sizeof(str));
    oput << "1233a" << 12.9 << 'A';
    //cout << oput.str() << endl;
    cout << str << endl;

    cin.get();
}