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
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ReplyDeleteWhat if struct size if more than the MAX int value, i.e you can't keep that value in an integer.
ReplyDeletei just want to know y have u used (char *) typecasting in ur pgm?
ReplyDeletehow will this work ?
ReplyDeleteThis may give you appx value...still depends on the padding
ReplyDeletestruct NODE_T p;
char s;
int size = (char*)&p-&s;
This doesn't work
ReplyDeletefor struct test {
int i;
char j;
}
the solution shows the size = 8 but it is 5
This comment has been removed by the author.
ReplyDeletestruct MyStruct *p=NULL;
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printf("size = %d",p);
typedef struct node
ReplyDelete{
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flaot a;
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Correct me if I am wrong.
struct el {
ReplyDeleteint 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.
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