C++: I/O流详解（三）——串流

 1 #include <iostream>
 2 #include <sstream>
 3 #include <string>
 4 #include <strstream>
 5 
 6 using namespace std;
 7 //?什么鬼？ 
 8 /*从输入串流对象提取数据 
 9 int main(){
10     string testStr("Input test 256*0.5");
11     string s1, s2, s3;
12     double x, y;
13     istringstream input(testStr); //用string对象构造串流对象
14     input>> s1>> s2>> x>> s3>> y;
15     cout<< s1<< ends<< s2<< ends<< x<< s3<< y<< "="<< x*y<< endl;
16     return 0;
17 }
18 */
19 
20 //向输出串流对象插入数据
21 /*
22 int main(){
23     ostringstream Output;
24     double x, y;
25     cout<< "Input x:";
26     cin>> x;
27     cout<< "Input y:";
28     cin>> y;
29     Output<<x<<"*"<<y<<"="<<x*y<<endl;
30     cout<<Output.str();
31     return 0;
32 } 
33 */
34 
35 //向输出串流对象插入数据
36 int main(){
37     char buf[80];
38     ostrstream Output(buf, sizeof(buf));//对Output的数据成员初始化 
39     double x, y;
40         cout<< "Input x:";
41     cin>> x;
42     cout<< "Input y:";
43     cin>> y;
44     Output<<x<<"*"<<y<<"="<<x*y<<endl;
45     cout<<Output.str();
46     return 0;
47 }