C language work needs

1. Type

1.1. __int64

// 声明一个长度为1的64位整型数组, 并赋初值为0
__int64 G[1] = {
    
    0};

// 输出64为整型
printf("%I64d\n", G[0])

1.2. Address

int element_id = &param;
printf("%p", element_id);

2. Make C language library

2.1. Notes - Preprocessing Directives

1. preprocessing directive

• #ifndef If not defined, keep segment 1

#ifndef 宏名
    程序段1 
#else 
    程序段2 
#endif

• #ifdef If defined, keep block 1

#ifdef 宏名
    程序段1 
#else 
    程序段2 
#endif

• Macro names must be globally unique
• #ifdef and #ifndef can only be followed by a macro name

example

1. .h文件definition

#ifndef C_ADD_H
#define C_ADD_H

int add(int a, int b);

#endif

2. .c文件Introduce the header file, and then implement

#include "add.h"

int add(int a, int b)
{
    
    
    return a + b;
}

3. Use custom library files

#include <stdio.h>
#include "add.h"

int main(void)
{
    
    
    int a = 20;
    int b = 10;
    printf("%d+%d=%d\n", a, b, add(a, b));
    return 0;
}

4. My vscode uses a custom library file, which needs to be processed

4.1. In the set search bar, CODE RUNNER

change the line in 4.2 below to *.c

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