Nested Structure

Nested Structure In C | Programmerdouts programmerdouts.blogspot.com/2019/06/nested-structure-c.html

Nested Structure Nested structure is structure which has another structure as a member in that structure.

A member of structure can be structure itself , this what we call as Nested Structure.

Let's understand it by an example.

let's define a structure student with roll no , div and name but should be structure which will have first name , surname as it's attribute.

Defining: structure name struct name { char first_name[20]; char surname_name[20]; };

Defining:Structure Student and using struture name as member in structure Student

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struct student //structure name { int rollno; //member1 ,integer variable which will store, //student roll no.

char div; //member2 a character variable, //which will store division of student. struct name n1; //member3 a structure name //which contains first name and //last name as its member. };

Let's understand visually

Now let's initialize the nested structure.

Initializing: struct student s1 = {1,A,{"Joel","Anthony"}};

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As member3 n1 is a structure name. that is why we have used another curly braces for member3 Now let's access the member of student structure Accessing:member rollno and div main() { int s_roll; char s_div; //Accessing rollno and assigning //it to a variable s_roll. s_roll = s1.rollno; //Accessing div and assigning //it to a variable s_div. s_div = s1.div; }

Now we will Access the member3 n1 which is the structure name. this is something new which we will going learn now.

Accessing:Member n1

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main() { char f_name[20] char s_name[20]; //Accessing first name and assigning //it to a variable f_name. strcpy( f_name, s1.n1.first_name); //Accessing div and assigning //it to a variable l_name strcpy(l_name,s1.n1.last_name);

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}

Let's access member n1 individually Accessing:first_name s1.n1.first_name;

Accessing:last_name s1.n1.last_name;

This is how we can make a nested structure.

There is a another way of defining nested structure but method accessing and initialization of members will remain same Let's see the another method of defining nested structure We will define the same structure student by another method

Defining:structure student by another method

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struct student { int rollno; //member1 ,integer variable which will store, //student roll no. char div; //member2 a character variable, //which will store division of student. struct name { char first_name[20]; //member3 a structure name //which contains first name and //last name as its member. char surname_name[20]; }n1;//declaring variable n1 //of structure name data type. };

This is how we can build a nested structure.

Do practice on structures for understanding the concept more better.

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