What is the difference between c language and go language?

Differences: 1. The extensions of C language source files are ".h" and ".c", and the extensions of Go language source files are ".go". 2. In C language, code is managed through files, while in Go language, code is managed through packages. 3. There are a total of 32 keywords in C language and a total of 25 keywords in Go language.

The operating environment of this tutorial: windows7 system, c99&&GO version 1.18, Dell G3 computer.

Source file comparison

• C language source file

• Go language source file

Comparison of code management

• Manage code through files in C language
  • When you want to use a certain function, you only need to include the corresponding .h file
• Go language uses packages to manage code
  • Go language does not have .h The concept of files, when you want to use a certain function in Go, you only need to import the corresponding package
• Public and private management of functions and variables in C language
  • Whether to expose functions and variables through extern and static
• Public and private management of functions and variables in Go language
  • Whether to expose functions through the capitalization of the first letter of the function name
  • Realize whether to expose variables by case of the first letter of the variable name

Comparison of keywords

• C language has a total of 32 keywords

1
• 2

• Each data type in C language occupies memory space

• Type
  32-bit compiler

64-bit compiler

• Each data type in Go language occupies memory space

• 1. Import the import "unsafe" package
  • 2. Calculate the variable memory space through unsafe.Sizeof()

• golang official website download go1.4 version source code
  • The code of the older version The purer it is, the more suitable it is for novices to learn
    • As the code is updated and iterated, it will gradually become very complex, so it is recommended to download version 1.4
  After decompression Open the path:
  • go\src\runtime\runtime.h

  
  ##Get the following implementation code

  // 第8行到35行 typedef signed char int8; typedef unsigned char uint8; typedef signed short int16; typedef unsigned short uint16; typedef signed int int32; typedef unsigned int uint32; typedef signed long long int int64; typedef unsigned long long int uint64; typedef float float32; typedef double float64; #ifdef _64BIT typedef uint64 uintptr; typedef int64 intptr; typedef int64 intgo; // Go's int typedef uint64 uintgo; // Go's uint #else typedef uint32 uintptr; typedef int32 intptr; typedef int32 intgo; // Go's int typedef uint32 uintgo; // Go's uint #endif #ifdef _64BITREG typedef uint64 uintreg; #else typedef uint32 uintreg; #endif // 第153行到157行 enum { true = 1, false = 0, };

So Brother Jiang taught you C language earlier In order to allow you to understand the implementation code of Go today, you should know what it is and why it is done

C language defines constant and variable format

数据类型 变量名称 = 值; const 数据类型 常量名称 = 值;

int main(){ /* 0110 a &^1011 b 如果b位位1,那么结果为0, 否则结果为a位对应的值 ---------- 0100 */ a1 := 6 b1 := 11 res1 := a1 &^ b1 fmt.Println("res1 = ", res1) // 4 /* 1011 a &^1101 b 如果b位位1,那么结果为0, 否则结果为a位对应的值 ---------- 0010 */ a2 := 11 b2 := 13 res2 := a2 &^ b2 fmt.Println("res2 = ", res2) // 2 }

返回值类型 函数名称(形参列表) { 函数体相关语句; return 返回值; }

func 函数名称(形参列表)(返回值列表) { 函数体相关语句; return 返回值; }

func (接收者 接受者类型)函数名称(形参列表)(返回值列表) { 函数体相关语句; return 返回值; }