- #include <stdio.h> 
- #define SIZE_OF(x) sizeof(x)/sizeof(x[0]) 
-   
- int main(void) { 
- 	int arr[2]; 
- 	printf("arr[2]の要素数はズバリ%zu!",-  SIZE_OF (- arr ));
 
- 	return 0; 
- } 
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