# Programming Languages

## What is the programming language?

Definition: A programming language enables description and solution of practical problems by providing a means to define the input, behavior and output of a program

## Syntax 语法

Definition: are the symbols and rules that are used to describe the input/output (e.g. variables) of the program as well as its behavior.

Key words:

1. form or structure
2. symbol and rules

## Semantics 语义

Definition:is the meaning of the symbols.

Key words:

1. Meaning

c：

printf("Hello World!\n");


c++：

cout<<"Hello World!"<<endl>;


java：

System.out.println("Hello World!");


1. Syntax is the form or structure
2. Semantics is the meaning

Definition:Is a style of programming, i.e. how to write and develop programs.

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