cin.getline() is skipping an input in C++ [duplicate]

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This:

cin>>n;

Is reading the number only.
It leaves the trailing '\n' on the stream.

So your first call to getline() is reading an empty line containing just a '\n'

It is best not to mix the use of operator>> and std::getline(). You have to be very careful on whether you have left the newline on the stream. I find it easiest to always read a line at a time from a user. Then parse the line separately.

 std::string  numnber;
 std::getline(std::cin, number);

 int n;
 std::stringstream numberline(number);
 numberline >> n;

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