C Structures ~ C Programming

C Structures

As you know different type of variables can be used for different purpose having different types of data-types. C supports such types of a constructed data type, which is called Structure. In Structure you can pack number of variables having different data type with single structure, which is called structure name or tag name or structure tag.

Definition of Structure ?
Structure Variables
Simple Structure Program...
Structure within Structure Nested Structure)
Structure and array

Definition :

A structure is heterogeneous collection of related fields. Here fields are called structure member or structure element. Every field has different type-specifier (data-type).

The definition of structure of opposite of array, because array is set of homogeneous elements. But the structure has deep relationship with array.

Structure Variables : The general syntax used to declare a structure and structure variables is written as below :
struct structure-tag
{
  date-type1 strcture element-1 or member-1;
  date-type2 strcture element-2 or member-2;
  date-type3 strcture element-3 or member-3;
  ......................................................;
  date-type n strcture element-n or member-n;
};
main()
{
  struct structure-tag v1,v2,..........vn;
  local declaration;
  executable statements;
}

Simple Structure Program :

#include<stdio.h>
#include<conio.h>
struct str
{
  char name[10],city[20];
};
void main()
{
  struct str obj1={"Bintu","Muktsar"};
  clrscr();

  printf("Name=%s",obj1.name);
  printf("\n City=%s",obj1.city);
  getch();
}

Output is as :

Name=Bintu
City=Muktsar

Note:- struct is the keyword which we can't use as a variable.

Structure within Structure (Nested Structure):

#include<stdio.h>
#include<conio.h>
struct str1      //First Structure
{
  char name[10];
  struct str2   //Second Structure
  {
    city[20];
  }objstr1;
}objstr2;

void main()
{
  printf("Enter the Name and City\n");
  scanf("%s%s",objstr1.Name,objstr2.city);
  printf("\nName=%s",objstr1.name);
  printf("\n City=%s",objstr1.objstr2.city);
  getch();
}

Output is as :
Enter the Name and City
Bintu
Muktsar
Name=Bintu
City=Muktsar

Structure and array :

Arrays play very important role with structure. Structure has two types of view with the array. The two types of relationship of structure with array...

/*Program to illustrate the concept of use of an Array within the Structure*/

#include<stdio.h>
#include<conio.h>
struct str
{
  name[10],char city[10];
};

void main()
{
  struct str n[10];
  int i=1;
  clrscr();
  printf("Enter the Ten Emp...\n");

  for(i=1;i<=10;i++)
  {
    scanf("%s%s",n[i].name,n[i].city);
  }

  printf("\nAfter the Inputting");

  for(i=1;i<=10;i++)
  {
    printf("\nName=%s",n[i].name);
    printf("\n City=%s",n[i].city);
  }
  getch();
}

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