struct in c

1#include<stdio.h>
2#include<string.h>
3
4struct Student{
5long int rollNo;
6int age;
7char name[50];
8int totalMarks;
9};
10
11int main(){
12
13    struct Student s1;
14    //accessing members of the struct
15    s1.rollNo = 1232234643;
16    s1.age = 10;
17    char s[]="Jonathan";
18    strcpy(s1.name,s);
19    s1.totalMarks = 450;
20
21    printf("RollNumber: %d \nName: %s \nTotal Marks: %d",s1.rollNo,s1.name,s1.totalMarks);
22
23return 0;
24}
25

1#include <stdio.h>
2#include <stdlib.h>
3
4struct book{ //this is like making a datatype of type book
5    //these are the fields
6  	char name[50];
7    char author[50];
8    char ISBN[11];
9};
10
11int main(){
12    struct book book1; //making an instance of book called book1
13    /*
14    normally to store integers in a struct we can do something like
15    book1.number_of_pages = 22; which is correct
16    however with character arrays we need to use the strcpy
17    function
18    */
19
20    strcpy(book1.name, "james and the giant tatti");
21    strcpy(book1.author, "Krishan Grewal");
22    strcpy(book1.ISBN, "12345678987");
23
24    printf("book name: %s\n", book1.name);
25  	printf("book author: %s\n", book1.author);
26  	printf("book ISBN: %s\n", book1.ISBN);
27
28return 0;
29}

1typedef struct {
2	char cognome[30];
3	char nome[20];
4	int voto;
5}alunno;
6

1The basic structure
2

1struct [structure_tag]
2{
3    //member variable 1
4    //member variable 2
5    //member variable 3
6    ...
7}[structure_variables];
8  

1// dichiarazione della struct
2struct libro
3{
4  char titolo[100];
5  char autore[50];
6  int anno_pubblicazione;
7  float prezzo;
8};
9
10//dichiarazione dell'istanza biblio
11struct libro biblio; 
12