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Writer's pictureApurba Paul

Structures and Unions

Structure stores the different types of elements i.e heterogeneous elements. The struct keyword is used to define structure. Syntax

struct structure_name

{

data_type member1;  

data_type memeberN;

};

1. By struct keyword within main() function

2. By declaring variable at the time of defining structure.

Example

#include <stdio.h>
#include <string.h>
struct student
{
int rollno;
char name[60];
}s1;  //declaring s1 variable for structure
void main( )
{
//store first employee information
s1.rollno=1;
strcpy(s1.name, “intellipaat”);//copying string into char array
//printing first employee information
printf( "Rollno : %d\n", s1.rollno);
printf( "Name : %s\n", s1.name);
}

Output Rollno : 1 Name : intellipaat

What are Unions in C?

Union also stores the different types of elements i.e heterogeneous elements. The union keyword is used to define structure. Union takes the memory of largest member only so occupies less memory than structures. Syntax

union union_name
{
data_type member1;
 
data_type memeberN;
};

Example

#include <stdio.h>
#include <string.h>
union student
{
int rollno;
char name[60];
}s1;  //declaring s1 variable for union
void main( )
{
//store first employee information
s1.rollno=1;
strcpy(s1.name, “intellipaat”);//copying string into char array
//printing first employee information
printf( "Rollno : %d\n", s1.rollno);
printf( "Name : %s\n", s1.name);
}

Output Rollno : 3546656 Name : intellipaat


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