Passing Structure to a Function in C with Example

Like other variables, we can also pass individual members of a structure and whole structure also ( structure variable).

First, let us see how to pass individual members of a structure.

Program 1 : Passing individual members of a structure to a function

#include<stdio.h>

//structure declaration

struct student{

   int rollno;

   float marks;

};

int display(int roll, float mrk){

  printf("\nRoll no : %d\tMarks : %.2f\n\n",roll,mrk);

}

int main(){

  struct student s;

  s.rollno=123;

  s.marks=95.5;

  display(s.rollno,s.marks);

  return 0;

}

Output:

Roll no : 123  Marks : 95.50

Program 2 : Passing structure variable to a function : Call by Value

#include<stdio.h>

//structure declaration

struct student{

   int rollno;

   float marks;

};

int display(struct student ss){

  printf("\nRoll no : %d\tMarks : %.2f\n\n",ss.rollno,ss.marks);

}

int main(){

  struct student s;

  s.rollno=123;

  s.marks=95.5;

  display(s);

  return 0;

}

Output:

Roll no : 123  Marks : 95.50

Program 3 : Passing structure variable to a function : Call by Reference

#include<stdio.h>

//structure declaration

struct student{

   int rollno;

   float marks;

};

int display(struct student *ss){

  printf("\nRoll no : %d\tMarks : %.2f\n\n",ss->rollno,ss->marks);

}

int main(){

  struct student s;

  s.rollno=123;

  s.marks=95.5;

  display(&s);

  return 0;

}

Output:

Roll no : 123  Marks : 95.50

Note that when accessing structure members by pointer to a structure, we ->(arrow operator) not dot(.) operator.

You may also like:
 Structure in C
 Typedef in C with examples
 Array of Structures in C with Example
 Self Referential Structures in C

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