1.1 Why use a language like C++

Conciseness
Maintainability
Portability
1.2 The compilation process

sorce file>>>Prcessed code>>>Object file

1.3 General notes on C++

case sensitive
2.1 hello world

Cpp代码
/*
* File: main.cpp
* Author: Gong Li
*
* Created on June 24, 2011, 9:18 PM
*/

#include

using namespace std;

/*
*
*/
int main() {
std::cout<<"Hello,world!";
return 0;
}

2.2 Tokens

keywords, identifiers,literals, operators, punctuation, whitespace

2.3 Explaination

comment: //.... or /*....*/
#include: the preprocessor dumping in the content of another file.
int main(){}: execute when the program starts up
cout <<: outputting some piece of text
namespaces: like std includes a group of idemntifiers
strings: Hello, world!
escape sequence:  ...
return 0: tell the OS it has completed successfully

3 Input

Input cin >> x

Output cout << "hello"