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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. #define ARRAYSIZE(arr) ((sizeof(arr) != sizeof(&arr[0])) ? \
  5.                        (sizeof(arr)/sizeof(*arr)) : \
  6.                        -1+0*fprintf(stderr, "\n\n** pointer in ARRAYSIZE !! **\n\n"))
  7.  
  8. int main(void) {
  9.  
  10. 	int test[12];
  11. 	int* test2 = malloc(12*sizeof(int));
  12.  
  13. 	printf("size = %d\n", ARRAYSIZE(test));
  14. 	printf("size = %d\n", ARRAYSIZE(test2));
  15.  
  16. 	free(test2);
  17.  
  18. 	return 0;
  19. }
  20.  
Success #stdin #stdout #stderr 0s 2248KB
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stdin
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Standard input is empty
stdout
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size = 12
size = -1
stderr
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** pointer in ARRAYSIZE !! **
https://ideone.com/OysRxe
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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