C + + Primer Plus Chapter II study notes

1. What is the role of #include <iostream>?

This compilation instruction causes the preprocessor to add the contents of the iostream file to the program, which is a typical preprocessing operation that replaces or adds text before the source code is compiled.

Io in iostream refers to input and output, and the input/output scheme in C + + involves multiple definitions in a iostream file, in order to display messages using cout, the first program needs these definitions, #include The compile instruction causes the contents of the iostream file to be sent to the compiler along with the contents of the source code file.

C + + Primer Plus Chapter II study notes