The use of stringstream c++ classes is similar to #include cin and cout components of a C++ program. The string stream is just another object, just like cout but the data goes into a C++ string instead of the console.
To be able to implement stringstreams, the #include header file is required. The advantage of using string streams is that it can be convenient between strings and other numerical types.
The basic methods for stringstream c++ include:
- clear() – Clears the error bits in the stringstream object so that it can be used again. It must be called each time you start parsing a new string with the stringstream object.
- str() – Returns the string associated with the stringstream object
- str(s) – Associates the string s to the stringstream object
- operator << – Add a string to the stringstream object
- operator >> – Read something from the stringstream object
In the example code below is applying stringstream to convert strings and other numerical types.
</pre> <pre>#include <iostream> #include <sstream> using namespace std; int main() { // create string object holding a number string str = "15.40 1540 hello world"; stringstream ss; // create a stringstream object ss << str; // feed in the value held in the string object float myFloat = 0; int myInt = 0; char myArray[20] = {}; char myChar = 0; ss >> myFloat; ss >> myInt; ss >> myArray; ss >> myChar; cout << "myFloat =" << myFloat << endl; cout << "myInt =" << myInt << endl; cout << "myArray =" << myArray << endl; cout << "myChar =" << myChar << endl; }</pre> <pre>
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