offset of a data member

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Jan 24, 2008
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Hi,

The below macro is defined in stddef.h standard header file.
#define offsetof(s,m) (size_t)&(((s *)0)->m)

This gives offset of member data 'm' in structure 's'

Ex:
struct example {
int a;
int b;
};

printf("%d", offsetof(example, b) ) displays 4 (In win32).

Please explain the behavior of above statement.
 

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