Function Implementation help!

[S3TkoG1T]

Hello!

I'm working with this function below:

 void print(std::string arr[], int n, std::ostream &os=std::cout);

I'm trying to implement this function, using the third parameter as the left-hand operand so instead of writing,

cout << "{"

I use

os << "{".

However I'm getting a GCC error that my "os was not declared in this scope".

Has anybody dealt with this before? I'm absolutely lost!

[vlad from moscow]

Show the statement where the error occured.