Structures
Predict the output of the following program
#include<stdio.h>
struct st
{
int x;
struct st next;
};
int main()
{
struct st temp;
temp.x = 10;
temp.next = temp;
printf("%d", temp.next.x);
return 0;
}
Compiler Error
We can access the data members of a union using the _____.
'.' operator
Can we create object of Enum?
No, it is not possible to create the object of Enum.
Which of the following operators can be applied on structure variables?
Equality comparison ( == )
Assignment ( = )
Both of the above
None of the above
Assignment ( = )
struct node
{
int i;
float j;
};
struct node *s[10];
The above C declaration define 's' to be ______ (GATE CS 2000)
An array, each element of which is a pointer to a structure of type node
In the context of C programming, what is a union?
A data type in C programming that allows different data types to be stored in the same memory location
What is the similarity between a structure, union and enumeration?
A.All of them let you define new values
B.All of them let you define new data types
C.All of them let you define new pointers
D.All of them let you define new structures
Option B
Predict the output of the following program
#include <stdio.h>
int main()
{
struct site
{
char name[] = "PROcoder";
int no_of_pages = 300;
};
struct site *ptr;
printf("%d ", ptr->no_of_pages);
printf("%s", ptr->name);
getchar();
return 0;
}
Compiler Error
Predict the output of the following code
#include <stdio.h>
#include <string.h>
struct Test
{
char str[20];
};
int main()
{
struct Test st1, st2;
strcpy(st1.str, "PROcoder");
st2 = st1;
st1.str[0] = 'S';
printf("%s", st2.str);
return 0;
}
PROcoder
Assume that the size of an integer is 32 bit. What is the output of the following program?
#include<stdio.h>
struct st
{
int x;
static int y;
};
int main()
{
printf("%d", sizeof(struct st));
return 0;
}
Compiler Error
What does ordinal() method do in Enum?
Ordinal method returns the order in which Enum instance are declared inside Enum. For example in a DayOfWeek Enum, you can declare days in order they come e.g.
public enum WeekDay{ MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY; }
Ordinal arranges or assigns numbers to each element in Enum starting from 0. MONDAY will be 0, TUESDAY will be 1 and so on. If we call WeekDay.Thursday.ordinal() it will return 3.
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 ________ (GATE CS 2000)
18 bytes
#include <stdio.h>
union test
{
int x;
char arr[4];
int y;
};
int main()
{
union test t;
t.x = 0;
t.arr[1] = 'G';
printf("%s", t.arr);
return 0;
}
Predict the output of the above program. Assume that the size of an integer is 4 bytes and size of a character is 1 byte. Also, assume that there is no alignment needed.
Nothing is printed
Can Enum implement interface in Java?
Yes, Enum can implement interface in Java. Since enum is a type, similar to class and interface, it can implement interface. This gives a lot of flexibility to use Enum as specialized implementation in some cases
#include <stdio.h>
union test
{
int x;
char arr[8];
int y;
};
int main()
{
printf("%d", sizeof(union test));
return 0;
}
Predict the output of the above program. Assume that the size of an integer is 4 bytes and the size of a character is 1 byte. Also, assume that there is no alignment needed.
8