Making sense of this image to array code

[ipunished]

I want to convert an image to a character array, I was able to find this code:

void main()
{
	fstream image;
	image.open("C:\\pic.bmp", std::ios_base::binary); //open pic in binary mode

	image.seekg (0, ios::end); //count from end of file to beginning
	int n = image.tellg(); //store current position of pointer in n
	image.seekg (0, ios::beg); //count from beginning of file

	char* res = new char[n];
	for(int i = 0; i < n; i++)
	res[i] = '5';

	bool bit = image.eof();

	image.read(res, n);
	
}

I understand most of it except this part:

res = '5';

can anyone explain this kine please and why is it here?

Thank you

 

[ipunished]

ok so i wrote it and ran the file and it did what i thought its writing every point in res equal to 5.. dont know why..

I want res to equal or take the value of image opened.. how do I do that?

Thanks