Try using pointers
struct MyStruct
{
int i;
int j;
};
int main()
{
struct MyStruct *p=0;
int size = ((char*)(p+1))-((char*)p);
printf("\nSIZE : [%d]\nSIZE : [%d]\n", size);
return 0;
}
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Please post your answer in comments if you have a better solution.
43 comments:
What if struct size if more than the MAX int value, i.e you can't keep that value in an integer.
i just want to know y have u used (char *) typecasting in ur pgm?
how will this work ?
This may give you appx value...still depends on the padding
struct NODE_T p;
char s;
int size = (char*)&p-&s;
This doesn't work
for struct test {
int i;
char j;
}
the solution shows the size = 8 but it is 5
struct MyStruct *p=NULL;
p++;
printf("size = %d",p);
typedef struct node
{
int data;
flaot a;
char b;
}node;
void main()
{
node a[2]={0};
printf("size = %d",a[1]-a[0]);
}
Correct me if I am wrong.
struct el {
int y;
char s[30];
};
el arr[3];
el *p1=arr;
el *p2=&arr[1];
long a1, a2;
cout << "The address of the first structure element: " << p1 << "\n";
cout << "The address of the second structure element: " << p2 << "\n";
a1=(long)p1; a2=(long)p2;
printf("Size is: %x in Hexadecimal\n", a2-a1);
//If you simply print p2-p1 you'll get 1 (pointer //arithmetics). I used long to match pointer size of 4 //bytes (different machines could differ, I use //Macbook pro, dual core (2009) 64 bit OS.
//This gives 24 in Hex which is 36 in Dec. so there is //little overhead for alignment on the structure //elements
Short and sweet.
struct moop {...};
size_t my_size = (size_t)&((moop*)NULL)[1];
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