Structures, Unions, Enums

The size of the following union, where an int occupies 4 bytes of memory is

union demo
{
  float x;
  int y;
  char z[10];
};

Anyone of the following can be used to declare a node for a singly linked list and “NODEPTR nodePtr;” can be used to declare pointer to a node using any of the following

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

A user defined data type, which is used to assign names to integral constants is called ____________

What is the similarity between a structure, union and enumeration?

Which of the following is an incorrect syntax to pass by reference a member of a structure in a function?

(Assume: struct temp{int a;}s;)

In the following program snippet, both s1 and s2 would be variables of structure type defined as below and there won't be any compilation issue.

typedef struct Student
{
 int rollno;
 int total;
} Student;
 
Student s1;
struct Student s2;

Consider the following C declaration

struct { 
    short s[5];
    union { 
         float y; 
         long z; 
    }u; 
} t;

Assume that objects of the type short, float and long occupy 2 bytes, 4 bytes and 8 bytes, respectively. The memory requirement for variable t, ignoring alignment considerations, is

Which of the following are incorrect syntax for pointer to structure?

(Assuming struct temp{int b;}*my_struct;)

What will be the output of the following C code?

#include
enum sanfoundry
{
    a,b,c=5
};
enum sanfoundry s;
main()
{
    c++;
    printf("%d",c);
}

Which of the following are themselves a collection of different data types?