c structures code example

Example 1: struct in C

#include<stdio.h>
#include<string.h>

struct Student{
long int rollNo;
int age;
char name[50];
int totalMarks;
};

int main(){

    struct Student s1;
    //accessing members of the struct
    s1.rollNo = 1232234643;
    s1.age = 10;
    char s[]="Jonathan";
    strcpy(s1.name,s);
    s1.totalMarks = 450;

    printf("RollNumber: %d \nName: %s \nTotal Marks: %d",s1.rollNo,s1.name,s1.totalMarks);

return 0;
}

Example 2: how to put a structure into a structure in c

#include <stdio.h>
#include <string.h>
 
struct student_college_detail
{
    int college_id;
    char college_name[50];
};
 
struct student_detail 
{
    int id;
    char name[20];
    float percentage;
    // structure within structure
    struct student_college_detail clg_data;
}stu_data;
 
int main() 
{
    struct student_detail stu_data = {1, "Raju", 90.5, 71145,
                                       "Anna University"};
    printf(" Id is: %d \n", stu_data.id);
    printf(" Name is: %s \n", stu_data.name);
    printf(" Percentage is: %f \n\n", stu_data.percentage);
 
    printf(" College Id is: %d \n", 
                    stu_data.clg_data.college_id);
    printf(" College Name is: %s \n", 
                    stu_data.clg_data.college_name);
    return 0;
}

Example 3: 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\n", book1.name);
  	printf("book author: %s\n", book1.author);
  	printf("book ISBN: %s\n", book1.ISBN);

return 0;
}

Example 4: C structure

struct struct1 {
  int a;
  char b;
}
typedef struct struct2 {
  int a;
  char b;
} name;

void main()
{
  struct struct1 var1;
  name			 var2;
  
  var1.a = 10;
  var2.b = 'c';
}

Example 5: 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;
}

Example 6: Structure of Structs in c

The basic structure