C

struct in c

typedef struct {
	char cognome[30];
	char nome[20];
	int voto;
}alunno;

structs in c

#include <stdio.h>
#include <stdlib.h>

struct book{ //this is like making a datatype of type book
    //these are the fields
  	char name[50];
    char author[50];
    char ISBN[11];
};

int main(){
    struct book book1; //making an instance of book called book1
    /*
    normally to store integers in a struct we can do something like
    book1.number_of_pages = 22; which is correct
    however with character arrays we need to use the strcpy
    function
    */

    strcpy(book1.name, "james and the giant tatti");
    strcpy(book1.author, "Krishan Grewal");
    strcpy(book1.ISBN, "12345678987");

    printf("book name: %s
", book1.name);
  	printf("book author: %s
", book1.author);
  	printf("book ISBN: %s
", book1.ISBN);

return 0;
}

declare structure in c

struct num{
 int a ;
 int b;
};

int main()
{
    struct num n;
    //accessing the elements inside struct
    n.a=10;
    n.b=20;
}

how to declare a struct in c

//option 1
typedef struct STRING{
    char *str;
    int length;
} STRING;
STRING var_name;
//option 2
struct STRING{
	char *str;
    int length;
};
struct STRING var_name;

C Syntax of struct

struct structureName {
  dataType member1;
  dataType member2;
  ...
};

how to declare a structure in C

struct book{
   int pages;
   char author[30];
   float price;
}b;

C Create struct Variables

struct Person {
  // code
};

int main() {
  struct Person person1, person2, p[20];
  return 0;
}