Streams

String Streams

By writing to a string stream, you can convert numbers to strings.
```
ostringstream outstr;
```
By using the << operator, the number is converted into a sequence of characters.
```
outstr << setprecision(5) << sqrt(2);
```
To obtain a string from the stream, call the str member function.
```
string output = outstr.str();
```

Example: (builds the string "January 23, 1955")

string month = "January";
int day = 23;
int year = 1955;
ostringstream outstr;
outstr << month << " " << day << "," << year;
string output = outstr.str();

Converting an integer into a string is such a common operation that is useful to have a helper function for it.
```
string int_to_string(int n)
{
   ostringstream outstr;
   outstr << n;
   return outstr.str();
}
```

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