C ++ Primer Reading Notes (1) Article 1: C ++ overview, Chapter 1: Start, primer Reading Notes

C ++ Primer Reading Notes (1) Article 1: C ++ overview, Chapter 1: Start, primer Reading Notes

1. Main Content

This article introduces the core idea of programming language and basic concepts of C ++.

What impressed me a lot isDivide and conque)Decomposition idea.

2. Knowledge Square

1) C ++ file suffix

• Cc, cpp, and cxx

2) compiler Functions

• 1. Check errors (syntax errors and type errors );
• Ii. Code Generation (Generating target code or assembly instructions)

3) implicit conversion of built-in types

• Int Truncation

4) # The include indicator reads the content of the specified file.

• <> Indicates a project or standard header file. Search for environment variables.
• "" Indicates that the user provides the header file. Search from the current directory.
• The introduction of nested header files promotes # ifndef to avoid repeated introduction of header files.
• C ++ name of the C library header file: cassert [the definition of C ++ name needs to be introduced by using namespace std], and the C Name Is assert. h.

5) define Preprocessor Constants

-D name

_ Cplusplus: c ++ file, __stdc __: c file

_ TIME __: TIME ,__ DATE __: DATE;

_ FILE __: Number of compiled lines. [Changeable]

6) input and output streams

Standard iostream: cin, cout, and cerr are pre-defined iostream objects. The endl is an iostream operator, indicating an operation. In addition to providing line breaks, the output buffer is refreshed.

File fstream: ifstream, ofstream object.