First, the development of language:
(1) high-level language (byte code):
Java, Python, PHP, C ++ , C #, GO language and so on.
(2) low-level language (machine code):
C language, assembly language, machine language.
Second, high-level language features:
(1) people-oriented, close to natural language and math formula.
(2) does not need to know the hardware system of a computer, it has an affinity. (Black box principle: do not need to understand the working principle, but he can operate ------ task for a junior programmer or just beginning to understand the people.)
(3) greatly reduce the development time is short, readable, maintainable.
Third, the low-level language features:
advantage:
High efficiency, can be read directly execute machine (binary code)
Disadvantages:
Poor readability (only 0 and 1), tedious programming.
Fourth, on the introduction of three languages:
Java：
例：class HelloWorld{
public static void main(String [] args){
System.out.println ( "This is the first Java program");
}
}
Features:
(1) Simple
(2) Object-Oriented
(3) Security
(4) cross-platform *
(5) Support multi-threading
python：
例：print("Hello World")
Features:
(1) do not need to declare variables.
(2) the language is simple, high development efficiency.
(3) has a wealth of library use.
C Language:
例：#include<stdio.h>
main(){
printf("HelloWorld");
}
特点：
（1）可以直接访问地址。
（2）运行效率高。
（3）功能强大。