Day 1: Introduction

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 Code
/*
* File: main. cpp
* Author: Gong Li
*
* Created on June 24,201 1, PM
*/

# Include <iostream>

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 shortdes 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"