Date: 2009apr6 Update: 2026sep29 Language: C/C++ Q. C/C++: I see ARRAYSIZE() is used in some MSDN sample code but I don't have it. What should it look like? A. Like this:

#ifndef ARRAYSIZE #define ARRAYSIZE(_a) (sizeof((_a)) / sizeof((_a)[0])) #endif

Example Use:

#include <stdio.h> int main() { char a[10]; const int n = ARRAYSIZE(a); printf("n=%d\n", n); }

Output:

n=10