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Size of Structure

 
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# 1  
Old 04-09-2008
Size of Structure
How can we find size of a structure with out using sizeof operator?

Thanks,
Harika
# 2  
Old 04-09-2008
one way to how they are allocated in memory:
Code:
typedef 
struct 
{
     char a;
     int b;
} mystruct_t;


int main()
{
	mystruct_t arr[2]={0x0,0};
	printf("%u %u\n", &arr[1], &arr[0]);
	return 0;
}

The difference between the two addresses is how the individual structs are parked in memory.
I get
Quote:
1885278376 1885278368
or 8 bytes, this is because both variables in the struct are word-aligned - ie on exact 4 byte boundaries.
# 3  
Old 04-09-2008
another way...

Code:
#include <stdio.h>

main(void)
{
    struct one
    {
        int a;
        char b;
    } x;
    char dummy;
    printf("size of struct one is %i bytes\n", (int) &(dummy) - (int) &(x.a));
}

 
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