sstream c++

1.读入一行，按空格分割：

#include
#include
#include
#include

using namespace std;

int main()
{
    string line;
    while(getline(cin,line))
    {
        int sum=0;
        string x;
        stringstream ss(line);
        while(ss>>x)
            cout<return 0;
}

2.用于格式转换

#include 
#include 
#include  

int main()
{
    std::stringstream stream;
    std::string result;
    int i = 1000;
    stream << i; //将int输入流
    stream >> result; //从stream中抽取前面插入的int值
    std::cout << result << std::endl; // print the string "1000"
} 

转自：http://blog.csdn.net/xiaogugood/article/details/21447431
3.字符转化为数字 和 数字转化为字符

#include 
#include 
#include 
using namespace std;


int main()
{
    //数字转换成字符串
    int i = 12345;
    string str;

    stringstream stream;

    stream << i;
    stream >> str;

    cout << str << endl;


    double di = 0.123456;    //double在我的机子上只能精确到6位
    //超过以后结果不确定
    stream.str("");                   //清空(都写上)
    stream.clear();               //记得要清空!!!

    stream << di;
    stream >> str;

    cout << str << endl;
    return 0;
}