Trusted answers to developer questions
Trusted Answers to Developer Questions

Related Tags

objective c

What are structures in Objective-C?

Salman Yousaf


We usually use arrays to hold information. However, in the Objective-C language, there is another way of performing the same task, commonly known as structures. Structures allow users to define their own data items that can be a combination of different data types.


    member 1;
    member 2;
// OR
struct variables(/*optional*/);

A struct is a user-defined data type that allows storing different kinds of information. It can be used to store various records of books, students, flight details, and so on.


Let's explain the Objective-C struct Structurein detail:

#import <Foundation/Foundation.h>
struct Drinks{
   NSString *Drink_name;
   NSString *Size;
   int drink_id;
int main() {
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
   struct Drinks mydrink1;
   struct Drinks mydrink2;

   mydrink1.Drink_name = @"Strawberry Icecream Shake";
   mydrink1.Size = @"Medium";
   mydrink1.drink_id = 10;

   mydrink2.Drink_name = @"Oreo Shake";
   mydrink2.Size = @"Large";
   mydrink2.drink_id = 12;

   NSLog( @"Shake#1 Name : %@\n", mydrink1.Drink_name);
   NSLog( @"Shake#1  Size : %@\n", mydrink1.Size);
   NSLog( @"Shake#1 Id: %d\n", mydrink1.drink_id);
   NSLog( @"Shake#2 Name: %@\n", mydrink2.Drink_name);
   NSLog( @"Shake#2 Size:%@\n", mydrink2.Size);
   NSLog( @"Shake#2 Id: %d\n", mydrink2.drink_id);
   [pool drain];
   return 0;
Using struct in Objective-C


  • Line 2: We define the structure by using struct Reserved keyword for structures in objective cfollowed by the name Drinks{}.
  • Lines 3-5: We define the members of the structure. It is the information we want to store in the Drinks struct: Drink_name, Size, and drink_id.
  • Line 6: The end of struct Drinks is followed by curly braces and a semicolon, ;.
  • Lines 9-10: We create two objects mydrink1 and mydrink2 of the type Drinks.
  • Lines 12-14: We set values for the mydrink1 object—its name, size, and ID.
  • Lines 16-18: We set values for the mydrink2 object—its name, size, and ID.

Note: We can use the scope resolution operator, ., to access member variables. For example, mydrink1.Size=@"Medium";

  • Lines 20-25: We print the values by using the NSLog() function on console.


objective c

View all Courses

Keep Exploring