C Structure as Function Argument

Welcome to another exciting lesson on C Programming at CodeYourCraft! Today, we're diving into using Structures as Function Arguments. Let's get started! 🎯

What is a Structure?

A structure (or struct) is a user-defined data type that allows us to group related variables together in C. It's like creating a custom box where we can store multiple items.

struct Student {
  char name[50];
  int age;
  float gpa;
};

In this example, we've defined a structure named Student with three properties: name, age, and gpa.

📝 Note: The keyword struct is optional when declaring variables of a custom type.

Passing Structures to Functions

Now that we have our Student structure, let's learn how to pass it as an argument to a function.

#include <stdio.h>

struct Student {
  char name[50];
  int age;
  float gpa;
};

void displayStudent(struct Student student) {
  printf("Name: %s\n", student.name);
  printf("Age: %d\n", student.age);
  printf("GPA: %.2f\n", student.gpa);
}

int main() {
  struct Student student = {"John Doe", 20, 3.8};
  displayStudent(student);
  return 0;
}

In this example, we've defined a function called displayStudent that takes a Student structure as an argument and prints its details. In the main function, we create a Student object with some sample data and call the displayStudent function with it as an argument.

Passing Structures by Reference

There's another way to pass structures as function arguments: by reference. This approach allows the function to modify the original structure passed to it.

#include <stdio.h>

void incrementAge(struct Student *student) {
  student->age++;
}

struct Student {
  char name[50];
  int age;
  float gpa;
};

int main() {
  struct Student student = {"John Doe", 19, 3.8};
  printf("Before increment: Age = %d\n", student.age);
  incrementAge(&student);
  printf("After increment: Age = %d\n", student.age);
  return 0;
}

Here, we've created a function called incrementAge that takes a pointer to a Student structure. By passing the address of the student object (&student), the function can increase the age of the student by one.

That's it for today! In the next lesson, we'll explore more advanced topics related to C structures. Stay tuned and keep coding! 💡

Happy learning! 📝