初探stringstream

stringstream 的用法就见代码吧：

///string 转 int
int main()
{
    string a="10";
    stringstream ss;
    int n;
    ss<<a;
    ss>>n;
    n+=5;
    printf("%d
",n);
    return 0;
}

///int 转 string
int main()
{
    int n=120;
    stringstream ss;
    ss<<n;
    string a;
    ss>>a;
    a+="123";
    cout<<a<<endl;
    return 0;
}

///string 转 int + 分离数
int main()
{
    string a;
    getline(cin,a);
    stringstream ss;
    ss<<a;
    int n;
    while( ss>>n ){
        cout<<n<<endl;
    }
    return 0;
}

///用于单词分割
int main()
{
    string a;
    getline(cin,a);
    stringstream ss;
    ss<<a;
    string word;
    while( ss>>word ){
        cout<<word<<endl;
    }
    return 0;
}

///string 转 double
int main()
{
    string result="1000.123";
    double n;
    stringstream stream;
    stream<<result;
    stream>>n;
    printf("%.6f
",n);
    return 0;
}

int main()
{
    string a;
    stringstream ss;
    while( getline(cin,a)){
       ss.clear();///清空其状态
       ss.str(""); ///清空其内容
       ss<<a;
       string word;
       while( ss>>word ){
            printf("%s
",word.c_str());
       }
    }
    return 0;
}