C++ the first cout will not be printed - c++

Question

As you can see, I have a cout here before the loop starts. Seekg starts at the beginning and the first word in the txtfile is "Hello". But it doesn't print it out(the first cout).
When I remove the while loop, then its not a problem, the first word gets included in the output.
The first "cout", shouldn't it be printed out no matter what comes after it? How is it possible that next lines of code(THIS case) affects the previous "cout" above it ?
int main()
{
string a;
ifstream myfile;
myfile.open("test.txt");
myfile.seekg(0);
getline(myfile,a);
cout << a << endl;
int z = 0;
while( a != "x" ) {
myfile.seekg(z);
getline(myfile,a);
z += a.size() + 2;
cout << a << endl;
}
}
I Also should mention that the file starts with "hello", AND contains 600 newlines and a word on every new line. The last line contains "x".
[EDIT]
Here's another example. I belive this will be helpful. This is my code now:
int main() {
string a;
ifstream myfile;
int newpos = 0;
myfile.open("example.txt");
myfile.seekg(newpos);
getline(myfile,a);
while (a != "x") {
myfile.seekg(newpos);
getline(myfile,a);
cout << a << endl;
newpos += a.size() + 2;
}
}
This is my textfile:
hello
johan
nils
erik
john
x
The output is exactly as it looks in the textfile above.(so far so good).
BUT, then I add about 600 new names to the list/textfile(same structure as above, no changes there, just new names added). Only ONE "hello" at the top so I can track the start, and one x at the end.
This still works with around 100 new names, hello is still printed out in the beginning. But when i add around 600 new names , hello will not be included(the very first cout). Why is that?

Answer 1

But when I add around 600 new names, hello will not be included (the very first cout).Why is that?
Looks like your Screen Buffer Size wasn't big enough to show all of the buffer lines. So when the number of printed lines exceeds a specific height, the console starts to ignore the previously printed lines which result you think it didn't print them all.
Since you're using Windows you can try to increase it as so
For all console apps
Right-click the title of the console and choose Defaults
go to Layout tab
Under the Screen Buffer Size, Increase the Height to (i.e 9001)
Click OK then restart the console
For a specific app
Right-click the title of the console and choose Properties
go to Layout tab
Under the Screen Buffer Size, Increase the Height to (i.e 9001)
Click OK.
Note that the Default Height in most Windows Operating systems is 9001.