istream >> operator

[NGambit]

Consider the following snippet:

void readFromAFile(string filename){
   ifstream is(filename);
   char ch;
   while(is){
	is>>ch;
	cout<<ch;
   }
}

Now, suppose the file contains "Hello!". When I call this function in my main it returns "Hello!!" Where is this extra "!" coming from?

[Lynx876]

After reading in the whole file, the last is >> ch; is failing. And after that, you still have cout << ch;.

Thus, you're printing the ch that was read before, in this case, the "!".

int main( int argc, char *argv[] )
{
	std::ifstream is( "test" );
	char ch;

	while( is )
	{
		if( ! ( is >> ch ) )
			break;

		std::cout << ch;
	}

	std::cout << '\n';

	return 0;
}

[NGambit]

Gotcha. Thanks Lynx876!

[Lynx876]

You're welcome! Happy coding (: