Struct

To declare a struct, we can use the keyword struct

struct Student {
  char *name;
  int age;
};

And then to declare it, we have to say struct Student. For example, to declare as an lvalue:

#include <stdio.h>

struct Student {
  char *name;
  int age;
};

int main(void) {
  struct Student student = { "Austin", 9 };
  printf("%s is %d\n", student.name, student.age);
}

Austin is 9

Refer to a struct field

As normal value

When a struct is created as a normal value (not pointer). We can use the . to refer to it.

Consider the same example:

#include <stdio.h>

struct Student {
  char *name;
  int age;
};

int main(void) {
  struct Student student = { "Austin", 9 };
  printf("%s is %d\n", student.name, student.age);
}

In this case, we use student.name and student.age to refer to the value Austin and 9

As pointer

Suppose that we have a pointer points to our struct, we can use -> to get the value. For example:

#include <stdio.h>

struct Student {
  char *name;
  int age;
};

int main(void) {
  struct Student student = { "Austin", 9 };

  struct Student *studentPointer = &student;

  printf("%s is %d\n", studentPointer->name, studentPointer->age);
}