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First understanding of structure

2022-07-28 18:29:00 【51CTO】
       
       #define _CRT_SECURE_NO_WARNINGS 1
       
       #include<stdio.h>
       
       // Initial structure 
       
       //struct stu //struct- Structure keywords  stu- Structural tag  struct stu- Type of structure  
       
       //{
       
       // char name[20];
       
       // short age;
       
       // char tele[12];
       
       // char sex[5];
       
       //}s1,s2,s3;//s1,s2,s3- Global structure variables 
       
       //int main()
       
       //{
       
       // struct stu s;//s- Local structure variables 
       
       // return 0;
       
       //}
       
       //
       
       //typedef struct stu//typedef- Rename this type 
       
       //{
       
       // char name[20];
       
       // short age;
       
       // char tele[12];
       
       // char sex[5];
       
       //}stu;// The name for stu
       
       //int main()
       
       //{
       
       // stu s1 = { " Zhang San ",20,"15866998877"," male " };
       
       // struct stu s2 = { " Li Si ",25,"18957568899"," A secret " };
       
       // return 0;
       
       //}
       
       //struct S
       
       //{
       
       // int a;
       
       // char c;
       
       // char arr[20];
       
       // double d;
       
       //};
       
       //struct T
       
       //{
       
       // char ch[10];
       
       // struct S s;
       
       // char* pc;
       
       //};
       
       //int main()
       
       //{
       
       // char arr[] = "hello world\n";
       
       // struct T t = { "hehe",{100,"w","hello hello",3.15}, arr};
       
       // printf("%s\n", t.ch);//hehe
       
       // printf("%s\n",t.s.arr);//hello hello
       
       // printf("%lf\n", t.s.d);//3.15
       
       // printf("%s\n", t.pc);//hello world
       
       // return 0;
       
       //}
       
       // When structures transmit parameters , To transfer the address of the structure .
       
       //typedef struct stu
       
       //{
       
       // char name[20];
       
       // short age;
       
       // char tele[12];
       
       // char sex[5];
       
       //}stu;
       
       //void Print1(stu tmp)
       
       //{
       
       // printf("name:%s\n", tmp.name);
       
       // printf("age :%d\n", tmp.age);
       
       // printf("tele:%s\n", tmp.tele);
       
       // printf("sex :%s\n", tmp.sex);
       
       //}
       
       //void Print2(stu* tmp)// This method is preferred 
       
       // // When a function passes parameters , Parameters need to be stacked , If you pass a structure object ,
       
       // // The structure is too large , The system overhead of parameter stack pressing is relatively large , So it can lead to performance degradation .
       
       //{
       
       // printf("name:%s\n", tmp->name);
       
       // printf("age :%d\n", tmp->age);
       
       // printf("tele:%s\n", tmp->tele);
       
       // printf("sex :%s\n", tmp->sex);
       
       //}
       
       //int main()
       
       //{
       
       // stu s = { " Li Si ",20,"15588886677"," male " };
       
       // Print1(s);
       
       // Print2(&s);
       
       // return 0;
       
       //}
       
       // The stack area ---- local variable , The formal parameter of the function , The space opened up by function calls 
       
       // Heap area ---- Dynamic memory allocation (malloc,free,realloc,calloc)
       
       // Static zone -- Global variables , Static variables 
       
       // data structure --｛【 Linear data structure -- The order sheet , Linked list , Stack , queue 】,【 Tree data structure -- Binary tree , chart 】｝
       
       // Stack ： First in, then out , Last in, first out .  Pressing stack -- Insert an element   Out of the stack -- Delete an element 
       
       //#include<stdlib.h>
       
       //int main()
       
       //{
       
       // int i = 0;
       
       // for (i = 0; i < 100; i++)
       
       // {
       
       // printf("%d ", i);
       
       // }
       
       // system("pause");// System commands - Pause 
       
       // return 0;
       
       //}
       
       // Realize it by yourself strcpy- String copy 
       
       //void my_strcpy(char* dest, char* src)// low-level 
       
       //{
       
       // while (*src != '\0')// Copy the preceding characters 
       
       // {
       
       // *dest = *src;
       
       // src++;
       
       // dest++;
       
       // }
       
       // *dest = *src;// Copy \0
       
       //}
       
       //
       
       //void my_strcpy(char* dest, char* src)// primary 
       
       //{
       
       // while (*dest++ = *src++)// hold src Copy the string to dest Point to space , contain \0 character .
       
       // {
       
       // ;
       
       // }
       
       //}
       
       //
       
       //void my_strcpy(char* dest, char* src)// intermediate 
       
       //{
       
       // if (dest != NULL && src != NULL)// Determine the valid address , Invalid no execution 
       
       // {
       
       // while (*dest++ = *src++)
       
       // {
       
       // ;
       
       // }
       
       // }
       
       //}
       
       //
       
       //#include<assert.h>
       
       //void my_strcpy(char* dest, char* src)// senior 
       
       //{
       
       // assert(dest != NULL);// Assertion -- Address invalid error 
       
       // assert(src != NULL);// Assertion 
       
       // while (*dest++ = *src++)// hold src Copy the string to dest Point to space , contain \0 character .
       
       // {
       
       // ;
       
       // }
       
       //}
       
       //int main()
       
       //{
       
       // char arr1[] = "*********";
       
       // char arr2[] = "hello";
       
       // my_strcpy(arr1, arr2);
       
       // printf("%s\n", arr1);
       
       // return 0;
       
       //}
       
       //
       
       //#include<assert.h>
       
       //char* my_strcpy(char* dest,const char* src)// A great god 
       
       // //const  Put in the pointer variable * On the left , Modification is *p, in other words : Cannot pass p To change *p Value  const char* p
       
       // //const  Put in the pointer variable * On the right , Decorated with pointer variables p In itself ,p Can't be changed  char* const p
       
       //{
       
       // char* ret = dest;
       
       // assert(dest != NULL);// Assertion -- Address invalid error 
       
       // assert(src != NULL);// Assertion 
       
       // while (*dest++ = *src++)// hold src Copy the string to dest Point to space , contain \0 character .
       
       // {
       
       // ;
       
       // }
       
       // return ret;
       
       //}
       
       //int main()
       
       //{
       
       // char arr1[] = "*********";
       
       // char arr2[] = "hello";
       
       // printf("%s\n", arr1);
       
       // printf("%s\n", my_strcpy(arr1, arr2));
       
       // return 0;
       
       //}
       
       // Realize it by yourself strlen- Find the string length 
       
       //#include<assert.h>
       
       //int my_strlen(const char* arr)
       
       //{
       
       // int count = 0;
       
       // assert(arr != NULL);// Guarantee the validity of the pointer 
       
       // while (*arr != '\0')
       
       // {
       
       // count++;
       
       // arr++;
       
       // }
       
       // return count;
       
       //}
       
       //int main()
       
       //{
       
       // char arr[] = "abcdefg";
       
       // int len = my_strlen(arr);
       
       // printf("%d\n", len);
       
       // return 0;
       
       //}
      
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First understanding of structure

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