C Basics - Structures and Pointers in C

Pointer to structure can be defined in the same way as you define pointer to any other variable.

struct Books *struct_pointer;

Before accessing the structure member, the structure pointer should be initialized. → operator is used to access the members of a structure using a pointer to that structure.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct employee {
   char  name[50];
   int   age;
   int   emp_id;
} ;

void printempdetails(struct employee *emp)
{
   printf("emp->name   : %s\n", emp->name);
   printf("emp->age    : %d\n", emp->age);
   printf("emp->emp_id : %d\n", emp->emp_id);
}
 
int main( ) {

   struct employee emp1;    
   struct employee *emp2 = malloc(sizeof(struct employee));    
   
   strcpy( emp1.name, "Bob Wright");
   emp1.age = 34;
   emp1.emp_id = 436587;

   strcpy( emp2->name, "John Ray");
   emp2->age = 27;
   emp2->emp_id = 192837;
   
   printf("Employee 1\n");
   printempdetails(&emp1);
   
   printf("Employee 2\n");
   printempdetails(emp2);
   
   return 0;
}

The output of the above program would be:

Employee 1
emp->name   : Bob Wright
emp->age    : 34
emp->emp_id : 436587
Employee 2
emp->name   : John Ray
emp->age    : 27
emp->emp_id : 192837

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Related topics:
Structures in C   |   Structures and Function Parameters in C   |   Structure Bit Fields in C   |   Union in C   |   Enumeration in C   |   Typedef in C

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List of topics: C Programming

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