Algorithm: The use of "istringstream"

Here shows some usages of the class "istringstream".

1. Decode sub-strings from a pure char string

e.g.,

       string str = "qq cc ddd";

       istringstream stream(str);

       int a;

       while (stream >> a){

              cout << a << endl;

       }

the sub-string in str is definded as strings separating by ' '. and therefore, the output should be:

qq

cc

ddd

And the loop will terminated automatically when it reaches the end of the str. 

2. Decode sub-strings from a int/char mixed string

       string str = "1, 22, 33";

       istringstream stream(str);

       int a;

       string b;

       while (stream >> a){

              stream >> b;

              cout << a << endl;

              cout << b << endl;

       }

So in this string str, there are int and char. In order to decode the int and char inside, the above code will output

1

,

22

,

33

,