What will be the Output ?

Question

1.00/5 (2 votes)

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C#

struct x
{
int i;
char c;
}

union y
{
struct x a;
double d;
};
printf("%d",sizeof(union y));

Options :-
a)8
b)5
c)4
d)1

Posted 30-Sep-15 1:41am

Member 10611055

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Comments

phil.o 30-Sep-15 7:47am

You really should do your homework by yourself.

Jochen Arndt 30-Sep-15 7:48am

Write a small program, compile it, and run it.

Krunal Rohit 30-Sep-15 7:48am

8.
-KR

2 solutions

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Krunal Rohit · Answer 1 · 2015-09-30T01:53:00

Solution 1

8.
Because, double is size of 8, so the union size will be 8 bytes (largest one).
int will occupy 2 or 4 bytes(compiler dependent) and char will 1 bytes, which makes the total of 3 or 5.
The memory occupied by a union will be large enough to hold the largest member of the union.

-KR

Posted 30-Sep-15 1:53am

Krunal Rohit

Updated 30-Sep-15 1:55am

v2

Comments

nv3 30-Sep-15 17:49pm

Who says int is always 2 or 4 bytes? On 64-bit machines it is often enough 8 bytes long. And makes struct x longer than 8 bytes.

Krunal Rohit 8-Oct-15 0:30am

I didn't say always. :D
I mentioned it's compiler dependent & forgot to write machine dependent as well. ( Solution #2)

CPallini · Answer 2 · 2015-09-30T01:53:00

Solution 2

No less than 8, with very high probably 8, however machine (and compiler) dependent.

Posted 30-Sep-15 1:53am

CPallini