In the C/C++ programming language, the structure is user-defined data types that allow us to store the combination of different data types together. All the different data type variables are represented by a single name.
Unlike an array that holds the data of the same type, the structure holds the data of different types in a contiguous memory location. It begins with the keyword
Suppose, we want to keep the record of students with their name(string), roll_no(int), address(string), Score(float) and these are of different data types. So instead of creating a different variable, again and again, we can simply create members for each student with their respective data.
Syntax of struct in C++:
The keyword used to define the structure is
Consider basic data of student: name, roll_no, score.
student structure is declared in the following way:
Declaring Structure variable
It means creating an instance of a structure in order to access the members of the structure. Once the structure
student is declared, its variable is created by adding the following in the main function.
struct student s1, s2;
s2 are structure variables of the type
Student. These are like the objects for the student just like an object in C++. When these variables are created, memory is allocated by the compiler.
Accessing Struct Members
The structure variable can be accessed by using a dot (.) operator.
Suppose you want to access the score of an
s1 student and assign it with a value of 80. This work can be performed in the following way.
s1.score = 80;
Example of C++ Structure
using namespace std;
Student s1, s2;
//Accessing Student members
strcpy(s1.name, "John Mac");
s1.roll = 101;
s1.score = 92.15;
strcpy(s2.name, "Mickey Macguel");
s2.roll = 102;
s2.score = 80;
//Display student 1 Info
cout << "Student 1 Information" <<endl;
cout << "Name: " << s1.name <<endl;
cout << "Roll No: " << s1.roll <<endl;
cout << "Score: " << s1.score <<endl <<endl;
//Display student 2 Info
cout << "Student 2 Information" <<endl;
cout << "Name: " << s2.name <<endl;
cout << "Roll No: " << s2.roll <<endl;
cout << "Score: " << s2.score <<endl;
Student 1 Information
Name: John Mac
Roll No: 101
Student 2 Information
Name: Mickey Macguel
Roll No: 102
After learning structure, go through the following topics in structure: