what will be output ? {{{

Samsung Interview Question for Software Engineer / Developers

1

of 1 vote

13
Answers
what will be output ?
```
class z
{
};

class x
{
int a;
};

int main()
{
std::cout << sizeof(X) << '\n';
std::cout << sizeof(z) << '\n';
}
```
- pramod August 26, 2012 in India | Report Duplicate | Flag | PURGE
Samsung Software Engineer / Developer

Email me when people comment.

An error occurred in subscribing you.

Country: India
Interview Type: Written Test

Email me when people comment.

An error occurred in subscribing you.

Comment hidden because of low score. Click to expand.

of 16 vote

output - 4,1
reason -
Class without any data members and member function such type of class is known as empty class. Size of object of empty class is always 1 byte.

When we create object of any class at that time object always gets 3 characteristics i.e.

State
Behaviour
Identity
When we create object of empty class at that time State of that object is nothing. Behaviour of that object is also nothing, but compiler assigns a unique address to that object. Memory in Computer is always organized in the form of bytes and minimum memory available at object address location is 1 byte. That's why size of object of empty class is 1 byte.

- pramod August 26, 2012 | Flag Reply

Comment hidden because of low score. Click to expand.

of 0 votes

On my machine sizeof(int) gives 4 .
and sizeof(x) is also coming 4 . So , in this case doesn't it have state behaviour and identity ? .
Also , when i add a double to x , sizeof(x) becomes 16. ( sizeof(double) is giving 8 )
??
If size of state and behaviour is increasing then they shouldn't be zero when only int is there.

- praveenkcs28 February 01, 2013 | Flag

Comment hidden because of low score. Click to expand.

of 0 votes

should be x instead of X in size of operator.

- pankaj October 20, 2014 | Flag

Comment hidden because of low score. Click to expand.

of 0 vote

question also contains why ? u have to write reason in space provided .....

- pramod August 26, 2012 | Flag Reply

Comment hidden because of low score. Click to expand.

of 0 vote

Very Helpful. Thanks

- teachMyself August 26, 2012 | Flag Reply

Comment hidden because of low score. Click to expand.

of 0 votes

Space is provided to distinguish between objects of the empty classes.
like if we create an array of empty class' objects.
then for compiler something should be assigned in memory to differentiate array[0] and array[1];

but what is the purpose of empty class is another big question :)

- Siddhesh August 27, 2012 | Flag

Comment hidden because of low score. Click to expand.

of 0 vote

i had writeen this code ...and i get ans as 2,1...

- john October 07, 2012 | Flag Reply

Comment hidden because of low score. Click to expand.

of 0 votes

#include<iostream>
using namespace std;

class z
{
};


class x
{
int a;
};



int main()
{
std::cout << sizeof(x) << '\n';
std::cout << sizeof(z) << '\n';
}

Run and check, you will get answers as 4, 1 as said before.

- Anonymous October 11, 2012 | Flag

Comment hidden because of low score. Click to expand.

of 0 votes

it also depends on the compiler, both are correct

- Anonymous October 18, 2012 | Flag

Comment hidden because of low score. Click to expand.

of 0 vote

http : // stackoverflow . com/questions/2362097/why-is-the-size-of-an-empty-class-in-c-not-zero

- rasmiranjanbabu March 03, 2013 | Flag Reply

Comment hidden because of low score. Click to expand.

of 0 vote

What will happen if there are multiple variables in a class?
class z
{char a;
float b;
int k;
};
what will sizeof(z) will return and why?

- Anonymous May 16, 2013 | Flag Reply

Comment hidden because of low score. Click to expand.

of 0 vote

The sizeof(z) here will return a value of 7 as char=1 ,int=2 and float=4 bytes but then again ,the output may vary from compiler to compiler.

CareerCup

Samsung Interview Question for Software Engineer / Developers

Books

Videos

Resume Review

Mock Interviews