Fifth Bureau akali teaching Bureau data analysis

/*
     Let's talk about pointers 
      Will be equivalent to a source file you create a shortcut , Right click shortcut --> Where to open the file ; Then you move the source file , You'll find that , No matter how your source files move , But you can find the location of the shortcut to open the file 
      This is equivalent to a pointer , Yours Wegame open lol In fact, it is also a pointer 
*/
//#include<stdio.h>
//int main()
//{
//    int number = 100;
//    int* point = &number;//int*（ Shaping the pointer ）, Because the number is int type ; Right click the target of the attribute in the shortcut to store the address , therefore &number（number The address of ）;point It's a pointer variable 
//    printf("%p\n", &number);//%p It's a printed address 
//    printf("%d\n", *point);//*p Is dereference , You can understand it as double clicking the shortcut （ Open shortcut ）
//    *point = 200;
//    printf("%d\n", *point);// It is equivalent to opening shortcut modification （ open word Document modification or something ）
//
//    // How much space does a pointer occupy ？
//    printf("%d\n", sizeof(char*));
//    printf("%d\n", sizeof(short*));
//    printf("%d\n", sizeof(int*));
//    printf("%d\n", sizeof(long*));
//    printf("%d\n", sizeof(long long*));
//    printf("%d\n", sizeof(float*));
//    printf("%d\n", sizeof(double*));
//    // The pointer size is the same      Pointers are used to store addresses    How big is the address , How much space is the pointer （ The ID number on the ID card , That piece of land can be lost , I care about you fat, thin, tall, short ）
//    
//    // I am 64 Bit , So the pointer size is 8 byte ;32 It's about 4
//    return 0;
//}

/*
     Tell me about just now printf("%p\n", &number); How did you get your address number 

     First of all, computers have 32（x86） Bit operating system and 64(x64) Bit operating system  
     With 32 Bit operating system, for example   32 Namely 32 Root address line , There are positive and negative charges after power on   Electrical signals are converted into digital information 0 and 1
     This is why computer language is a binary language 
    0 and 1 A total of 2^32 An orderly sequence of numbers （ Memory unit ）
     then 2^32  /  8 = ？？？ Divide bytes again 1024 Wait, you can calculate 
     If you take a bit as an address , One char To occupy 8 An address , Is this a little too wasteful 
     therefore C It is stipulated that a memory unit is a byte , Then assign an address 

*/

/*-----------------------------------------
   To describe a complex object , So there is a structure 
   You can't be used by others int,char Wait to describe , Is he a combination of good looks and intelligence , ha-ha 

*/
#include<stdio.h>
struct people {
    char name[20];
    int EQ;
    int IQ;
    double height;
};
int main()
{
    struct people one = { " Zhang San ", 85, 90, 165.51 };// The first person to create and information （ Structure appears and initializes ）
    printf("1.%s %d %d %lf\n", one.name, one.EQ, one.IQ, one.height);// The first person . Corresponding information （ Structure member variables ）
    struct people* point = &one;// Structure pointer 
    printf("2.%s %d %d %lf\n", (*point).name, (*point).EQ, (*point).IQ, (*point).height);
    printf("3.%s %d %d %lf\n", point->name, point->EQ, point->IQ, point->height);//point（ Shortcut ）->name（ Source program ）
    return 0;
}