what is the size of this class class size { public: char data1; doub

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Question

what is the size of this class
class size
{
public:
	char data1;
	double d;
	int data2;
	char data3;
	double data4;
	short data5;
};

please explain the padding for these double variables.

Question Submitted By :: Tarun

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Re: what is the size of this class class size { public: char data1; double d; int data2; char data3; double data4; short data5; }; please explain the padding for these double variables.

Answer
# 1

double will occupies 8 bytes. so here two double data type 
variables create then this class size is 21

char    1 b
double  8 b
int     2 b
char    1 b
double  2 b
short   1 b

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Nomesh

Re: what is the size of this class class size { public: char data1; double d; int data2; char data3; double data4; short data5; }; please explain the padding for these double variables.

Answer
# 2

This size is 32

Char : 1 + 3 bytes padding
Doube : 8 Bytes
int   : 4 bytes 
char  : 1 + 3 bytes padding
double : 8 bytes
short : 4 bytes

so 32 bits

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Nivvy

Re: what is the size of this class class size { public: char data1; double d; int data2; char data3; double data4; short data5; }; please explain the padding for these double variables.

Answer
# 3

absolutely correct navvy agreed !!

just a minor change 

short : 2  bytes + 2 byte padding

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Abhishek

Re: what is the size of this class class size { public: char data1; double d; int data2; char data3; double data4; short data5; }; please explain the padding for these double variables.

Answer
# 4

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Lakshmi Sahu

Re: what is the size of this class class size { public: char data1; double d; int data2; char data3; double data4; short data5; }; please explain the padding for these double variables.

Answer
# 5

I have a small doubt.. isnt it based upon the underlying 
platform on which this piece of code is run?
as far as my c++ knowledge goes, the size of each datatype 
varies for each platform unlike java. this is the reason 
why java ensures portability of code, while c++ doesnt.
please tell me if i am wrong...

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Kanthi

Re: what is the size of this class class size { public: char data1; double d; int data2; char data3; double data4; short data5; }; please explain the padding for these double variables.

Answer
# 6

Just as an extension to my point in the previous post... 
http://www.cplusplus.com/doc/tutorial/variables.html

the section fundamental datatypes in the above article 
substantiates my point...

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Kanthi

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