The size of the load of the structure of the order of the elements

Hello

I use a structure in an application of LabWindows and I have problems with its size. Its size seems to depend on order of the elements.

Here is a program that identifies the problem:

#include

typedef struct {}
unsigned short int try;
float try2.
Double try3;
} STRUCT1;

typedef struct {}
float try2.
Double try3;
unsigned short int try;
} STRUCT2.

int main (int argc, char * argv [])
{
int number = 0;

printf ("the size of the memory of STRUCT1 is:%d",sizeof(STRUCT1));
printf ("\nThe memory size of STRUCT2 is:%d",sizeof(STRUCT2));
scanf ("%d", & Number);
 
return 0;
}

If I run this program using LabWindows 8.5, I get the following:

The size of the memory of STRUCT1 is: 16

The size of the memory of STRUCT2 is: 24

even if the structures are identical.

The problem is that I try to access the location of the memory of the structure byte by byte to a parity check but sizeof

do not return the actual size of my structure and so I'll be back to random data. Has anyone encountered the same problem?

Thank you

Cyril

It is a debate here that should explain what is happening.

JR

Tags: NI Software

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