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- Nested structure in C is nothing but structure within structure. One structure can be declared inside other structure as we declare structure members inside a structure.
- The structure variables can be a normal structure variable or a pointer variable to access the data. You can learn below concepts in this section.
- Structure within structure in C using normal variable
- Structure within structure in C using pointer variable
1. Structure within structure in C using normal variable:
- This program explains how to use structure within structure in C using normal variable. “student_college_detail’ structure is declared inside “student_detail” structure in this program. Both structure variables are normal structure variables.
- Please note that members of “student_college_detail” structure are accessed by 2 dot(.) operator and members of “student_detail” structure are accessed by single dot(.) operator.
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#include <stdio.h> #include <string.h> struct student_college_detail { int college_id; char college_name[50]; }; struct student_detail { int id; char name[20]; float percentage; // structure within structure struct student_college_detail clg_data; }stu_data; int main() { struct student_detail stu_data = {1, "Raju", 90.5, 71145, "Anna University"}; printf(" Id is: %d \n", stu_data.id); printf(" Name is: %s \n", stu_data.name); printf(" Percentage is: %f \n\n", stu_data.percentage); printf(" College Id is: %d \n", stu_data.clg_data.college_id); printf(" College Name is: %s \n", stu_data.clg_data.college_name); return 0; } |
Output:
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Id is: 1
Name is: Raju Percentage is: 90.500000 College Id is: 71145
College Name is: Anna University |
Structure within structure (nested structure in C ) using pointer variable:
- This program explains how to use structure within structure in C using pointer variable. “student_college_detail’ structure is declared inside “student_detail” structure in this program. one normal structure variable and one pointer structure variable is used in this program.
- Please note that combination of .(dot) and ->(arrow) operators are used to access the structure member which is declared inside the structure.
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#include <stdio.h> #include <string.h> struct student_college_detail { int college_id; char college_name[50]; }; struct student_detail { int id; char name[20]; float percentage; // structure within structure struct student_college_detail clg_data; }stu_data, *stu_data_ptr; int main() { struct student_detail stu_data = {1, "Raju", 90.5, 71145, "Anna University"}; stu_data_ptr = &stu_data; printf(" Id is: %d \n", stu_data_ptr->id); printf(" Name is: %s \n", stu_data_ptr->name); printf(" Percentage is: %f \n\n", stu_data_ptr->percentage); printf(" College Id is: %d \n", stu_data_ptr->clg_data.college_id); printf(" College Name is: %s \n", stu_data_ptr->clg_data.college_name); return 0; } |
Output:
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Id is: 1
Name is: Raju Percentage is: 90.500000 College Id is: 71145 |
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