C language Getting Started Guide

List of articles

Chapter two C Language learning framework and simple code

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List of articles

• List of articles
• Preface
• One 、pandas What is it? ？
• Two 、 Use steps
  • 1. Import and stock in
  • 2. Read in the data
• summary

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Preface

With C Language learning tools this chapter will build a C Language learning framework

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One 、C Language content

C The content of language is simply classified as follows ：

 1. keyword       2. The operator         3. Branch and loop statements           4. function            5. Array           6. The pointer

 7. Structure        8. File operations

（ Keywords and operators will be explained in specific code blocks ）

Two 、 Simple code

1. Simple input and output

The code is as follows （ Example ）：

#include <stdio.h>

int main()
{
	printf("hallo");
	return 0;
}

Code block parsing ： 

 

As shown in figure, 1.

stay C The language program must contain a main function, that is main function , because C Language programs start from mian Function to , Also in main End of the function , The lack of main Function programs cannot be executed , all main The importance of functions is self-evident . 

As shown in figure, 2. 

printf Is an output function using printf You can print the contents in double quotation marks on the screen, and the results are as follows ：

 

 

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summary

All procedures are from main Function to , from main End of the function