C + +, C #, Python, go language basic syntax comparison

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1 variables

1.1 Definitions

C++

1) data type variable name ;//single variable definition
2) data type variable name = initial value;//A single variable is defined and initialized
3) data type variable name 1, variable name 2;//Use comma to define multiple same type variables at once
4) auto variable name = initial value;//automatic derivation of variables using auto keyword (c++11)
5) static data type variable name = initial value;//local static variable
6) extern data type variable name ;//declare variable (defined in other location)

C#

1) data type variable name ;//single variable definition
2) data type variable name = initial value;//A single variable is defined and initialized
3) data type variable name 1, variable name 2;//Use comma to define multiple same type variables at once
4) var variable Name = variable initial value;//c#3.0 Introduction

Python

1) variable name = variable initial value;

GO

1) var variable name data type ;//single variable declaration
2) var variable name 1, variable name 2 data type ;//multiple variable declaration
3) variable name = variable initial value ;//Direct Assignment Mode declaration

1.2 Constants

C++

Const Data Type variable Name = variable value;
#define Variable Name variable value

C#

Const Data Type variable Name = variable value;

Python

Definition of uncertainty quantity

GO

Const variable name Data type = variable value;
Const variable NAME = variable value;

2 Basic statements

2.1 SELECT statement

C++

//if StatementsifConditions//must have parentheses{//The code snippet executes when the condition is true}//if Else StatementifConditions {//The code snippet executes when the condition is true}Else{//The statement segment is executed when the condition is false}//switch StatementsSwitch(expression) { CaseConstant value1://Only integer constants are supported{//condition is constant value 1 o'clock execute code snippet} Break;//Omit break when a constant value of 2 code snippet is also executed when the condition is a constant value of 1 CaseConstant value2:  {//condition is constant value 1 o'clock execute code snippet} Break;default:  {Execute code snippet when//condition is other value} Break;}

C#

//if StatementsifConditions//must have parentheses{//The code snippet executes when the condition is true}//if Else StatementifConditions {//The code snippet executes when the condition is true}Else{//The statement segment is executed when the condition is false}//switch StatementsSwitch(expression) { CaseConstant value1://Support integer constants and string constants{//condition is constant value 1 o'clock execute code snippet} Break;//Omit break when a constant value of 2 code snippet is also executed when the condition is a constant value of 1 CaseConstant value2:  {//condition is constant value 1 o'clock execute code snippet} Break;default:  {Execute code snippet when//condition is other value} Break;}

Python

  if 语句  if 条件:      语句块  ifelse语句  if 条件1:      条件1语句块  else:      语句块  ifelif语句  if 条件1:      条件1语句块  elif 条件2:      条件2语句块  else:      语句块

GO

  //if 语句  if'{'必须与if同行且不可省略  }  //ifelse语句  if 条件 {//'{'必须与if同行且不可省略  else {//'{'必须与else同行且不可省略  }

2.2 Cycles

C++

  //for循环  for (初始化; 条件; 增量)//初始化、条件与增量均可省略  {  }  //while循环  while (条件)  {  }  //dowhile循环  do  {  while(条件); //注意必须有';'

C#

  //for循环  for (初始化; 条件; 增量)//初始化、条件与增量均可省略  {  }  //foreach循环  foreachin 集合或者数组)  {  }  //while循环  while (条件)  {  }  //do while循环  do  {  while//注意必须有';'

Python

  //for语句  forin 序列:      代码段  else:      代码段  //while语句  while (条件):      代码段

GO

  //for语句  for 初始化; 条件; 步进; {  }  //c语言while样式  for 条件 {  }  //无限循环  for {  }

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