Structures, Unions, Enums

The number of distinct nodes the following struct declaration can point to is

struct node
{
   struct node *left;
   struct node *centre;
   struct node *right;
};

#include >stdio.h>

typedef enum{
    Male, Female=-1
}SEX;

int main()
{
  SEX var = Male;
  SEX var1 = Female;
  printf("%d %d",var, var1);
  return 0;
}

Which of the following accesses a variable in structure b?

What is the output of this program?

#include 
int main()
{
    union demo {
        int x;
        int y;
    };
 
    union demo a = 100;
    printf("%d %d",a.x,a.y);
}

What is the output of this program?

#include 
void main()
{
  struct number
  {
    int no;
    char name[20];
  };
  struct number s;
  s.no = 50;
  printf("%d", s.no);
}

size of union is size of the longest element in the union

It is not possible to create an array of pointer to structures.

Which of the following structure declaration will throw an error?

The following C declarations

struct node
{
   int i;
   float j;
};
struct node *s[10] ;

define s to be

Anyone of the followings can be used to declare a node for a singly linked list. If we use the first declaration, “struct node * nodePtr;” would be used to declare pointer to a node. If we use the second declaration, “NODEPTR nodePtr;” can be used to declare pointer to a node.

/* First declaration */
struct node {
int data;
struct node * nextPtr;
};
 
/* Second declaration */
typedef struct node{
int data;
NODEPTR nextPtr;
} * NODEPTR;