C語言中的嵌套結構是什麼？

結構內的結構（或）巢狀結構

#另一個結構內的結構稱為巢狀結構。

考慮以下範例，

>

struct emp{
   int eno;
   char ename[30];
   float sal;
   float da;
   float hra;
   float ea;
}e;

所有屬於配額的項目都可以組合在一起並在子結構下申報，如下所示。

stuct emp{
   int eno;
   char ename[30];
   float sal;
   struct allowance{
      float da;
      float hra;
      float ea;
   }a;
}e;

嵌套結構中最裡面的成員可以透過使用點運算子來變更所有相關結構變數（從最外層到最內層）來存取該成員。

程式

以下程式是示範巢狀結構（結構內的結構） -

 Live Demo

#include<stdio.h>
//Declaring outer and inter structures//
struct Person//Main Structure//{
   char Name[500];
   int Age;
   char Gender;
   char temp;//To clear buffer//
   struct Address//Nested Structure//{
      char Apartment[500];
      char Street[500];
      char City[100];
      char State[100];
      int Zipcode;
   }a[20];//Nested Structure Variable//
   }p[20];//Main Structure Variable//
void main(){
   //Declaring variable for For loop//
   int i;
   //Reading User I/p//
   for (i=1;i<3;i++){//Declaring function to accept 2 people&#39;s data//
      printf("Enter the Name of person %d : ",i);
      gets(p[i].Name);
      printf("Enter the Age of person %d : ",i);
      scanf("%d",&p[i].Age);
      scanf("%c",&p[i].temp);//Clearing Buffer//
      printf("Enter the Gender of person %d : ",i);
      scanf("%c",&p[i].Gender);
      scanf("%c",&p[i].temp);//Clearing Buffer//
      printf("Enter the City of person %d : ",i);
      gets(p[i].a[i].City);
      printf("Enter the State of person %d : ",i);
      gets(p[i].a[i].State);
      printf("Enter the Zip Code of person %d : ",i);
      scanf("%d",&p[i].a[i].Zipcode);
      scanf("%c",&p[i].temp);//Clearing Buffer//
   }
   //Printing O/p//
   for (i=1;i<3;i++){
      printf("The Name of person %d is : %s</p><p>",i,p[i].Name);
      printf("The Age of person %d is : %d</p><p>",i,p[i].Age);
      printf("The Gender of person %d is : %c</p><p>",i,p[i].Gender);
      printf("The City of person %d is : %s</p><p>",i,p[i].a[i].City);
      printf("The State of person %d is : %s</p><p>",i,p[i].a[i].State);
      printf("The Zip code of person %d is : %d</p><p>",i,p[i].a[i].Zipcode);
   }
}

輸出

Enter the Name of person 1 : Enter the Age of person 1 : Enter the Gender of person 1 : Enter the City of person 1 : Enter the State of person 1 : Enter the Zip Code of person 1 : Enter the Name of person 2 : Enter the Age of person 2 : Enter the Gender of person 2 : Enter the City of person 2 : Enter the State of person 2 : Enter the Zip Code of person 2 : The Name of person 1 is :
The Age of person 1 is : 0
The Gender of person 1 is :
The City of person 1 is :
The State of person 1 is :
The Zip code of person 1 is : 0
The Name of person 2 is :
The Age of person 2 is : 0
The Gender of person 2 is :
The City of person 2 is :
The State of person 2 is :
The Zip code of person 2 is : 0

#

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