I am confuse about using cin; cin.getline() and gets_s. I understand that cin can be used to input all data types and cin.getline() is only for strings and gets_s is for struct.

But I am using cin to input a string now and it works perfectly, but how strange cin.getline doesn’t work although I use cin.ignore() (the output isn’t enough). Please help me to figure it out. Tks.