C - Basics Program what is the output?

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C#

What is the size of  the following structure?
typedef  struct
{
   int ctrl1;
   char flag;
   char flag2;
   int ctrl2;
   int ctrl3;
} MYREG;


a)14
b)20
c)24
d)16

Posted 21-Jan-13 0:27am

mvigsnhwar

Updated 21-Jan-13 0:29am

v2

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OriginalGriff · Accepted Answer · 2013-01-21T00:50:00

Depends on a number of factors, primarily which compiler you use.
If you use an old 16 bit compiler, then an int is 2 bytes.
If you use a more modern compiler, then an int can be 4 or 8 bytes (I've yet to see a C compiler that used 128 bit integers).

In addition, it will depend on your compiler options - some will "pack" the structure by default, others won't. If they do pack it, it may depend on the target processor and the compiler efficiency - some combinations will compact the two characters to successive bytes, and the following int into the next two bytes, others will require each int to start on a 4 byte boundary.

So, Compile it, and try it. It isn't difficult for you to come up with a definitive answer for your configuration.