(Post READING) C ++ primer (Fourth Edition) Chapter 3 Quick Start standard library type

Abstract types are called abstract types because we do not need to care about how they are expressed during use. We only need to know which operations are supported by these abstract types. The string type is not the same as the string type of the standard library.

Cin> S. If you enter Hello world, only hello will be saved to S, because the standard input will read the string until a blank character is encountered again.

Cout <"Hello World", the entire string is output.

Vector is a container, not a data type, and vector <int> is a data type.

The iterator is a pointer. Vector <int>: iterator iter = ivec. begin (); ITER ++ moves to the next element. The reason that ITER knows to move several bytes is that the vector <int> type already tells ITER that an element occupies 4 bytes.