stringstream question

[masiht]

Can anyone please tell me what is the line
stringstream(mystr) >> yours.year;
doing in this program.
I will be thankful if you can give me an easy example which uses only this.
stringstream(mystr) >> yours.year;



#include <iostream>
#include <string>
#include <sstream>
using namespace std;

struct movies_t {
string title;
int year;
} mine, yours;

void printmovie (movies_t movie);

int main ()
{
string mystr;

mine.title = "2001 A Space Odyssey";
mine.year = 1968;

cout << "Enter title: ";
getline (cin,yours.title);
cout << "Enter year: ";
getline (cin,mystr);
stringstream(mystr) >> yours.year;

cout << "My favorite movie is:\n ";
printmovie (mine);
cout << "And yours is:\n ";
printmovie (yours);
return 0;
}

void printmovie (movies_t movie)
{
cout << movie.title;
cout << " (" << movie.year << ")\n";
}

[firedraco]

It is creating a stringstream by passing a string to the constructor, then putting it in yours.year.

[seymore15074]

I would expect it to only read the integer-portion...for example, inputting "10abc and 5 more words blah you see!" will be stored in mystr, and a temporary stringstream will be constructed containing that string, but then an int will be extracted from it putting only 10 into yours.year.

[masiht]

Can you please give any easy example of using stringstream(mystr) >> yours.year;?

[Bazzy]

stringstream( "123 abcd" ) >> variable; gives the value 123 to the variable.

An example with named objects could be easier:

string myString = "123"; // string with some text in it
int number; // number which needs a value
stringstream myStringStream( myString ); // stream created with the contents of the string
myStringStream >> number; // giving the value of 123 to the number 

The same result could be achieved with an unnamed stringstream object:

string myString = "123"; // string with some text in it
int number; // number which needs a value
stringstream ( myString ) >> number; // giving the value of 123 to the number from a stream created with the contents of the string 

[masiht]

Thank you bazzy !