C-language struct (nested struct-structure array)

//structs--nested structures and struct arrays#define_crt_secure_no_warnings#include<stdio.h>#include<stdlib.h>#include<string.h>typedefstruct_parent{intnum; Charname[ -]; //struct internally defines a struct, and if a nested struct variable is not defined, then the property of the nested struct is treated as a property of the parent structure body    structson{intAge ; Charsname[ -]; };} Parent;typedefstruct_parent2{intnum; Charname[ -]; //struct internally defines a struct, if a nested struct variable is defined, the property of the nested struct cannot be called by the parent struct//But the parent struct can call the nested struct-body variable    structson2{intAge ; Charsname[ -]; }S1;} Parent2;structparent3{intnum; Charname[ -];} parr2[2] = { {5,"Father 5"}, {6,"Father 6"} };//struct Array definition initialization twovoidMain () {/*Nested structure Body*/Parent p1; P1.num=1; sprintf (P1.name,"Father"); P1.age= A; sprintf (P1.sname,"son"); printf ("num=%d;name=%s;age=%d;sname=%s\n", P1.num,p1.name,p1.age,p1.sname);    Parent2 P2; P2.num=2; sprintf (P2.name,"Father 2"); P2.s1.age= -; sprintf (P2.s1.sname,"son 2"); printf ("num=%d;name=%s;age=%d;sname=%s\n", P2.num, P2.name, P2.s1.age, p2.s1.sname); /*definition of an array of structural bodies*/Parent2 parr1[2] = { {3,"Father 3", A,"son 3"}, {4,"Father 4", the,"son 4"} };//The struct array defines the initialization of a//Parent2 PA1, PA2; //Parent2 ptd[2] = {PA1, PA2};     /*Error : Error C2440: "Initialize": Cannot convert from "Parent2" to "int" rror C2440: "Initialize": Cannot convert from "Parent2" to "char"*/    //There is no such structure initialization, the C language compiler treats PA1 as the first parameter of the first struct element, and//PA2 as the second parameter of the first struct element//so the errorParent2 ptdd[2]; memset (PTDD,0,sizeof(PTDD)); memset (&PTDD, 0, sizeof (PTDD)); //Two types of initialization are correct, the second is recommended because the second is more consistent with the use of the Memset function, the second pointer is a pointer to the array, the first pointer is a pointer to the first element of the array
The purpose of using memset () Here is to initialize the entire array, so the second one is more consistent.
System"Pause");}

C-language struct (nested struct-structure array)