Find size of array without using sizeof

by

&arr is a pointer to an array of 100 ints.

The [1] means “add the size of the thing that is pointed to”, which is an array of 100 ints.

So the difference between (&arr)[1] and arr is 100 ints.

(Note that this trick will only work in places where sizeof would have worked anyway.)

More Related Contents:

  1. How to find the ‘sizeof’ (a pointer pointing to an array)?
  2. Why isn’t the size of an array parameter the same as within main?
  3. C sizeof a passed array [duplicate]
  4. Why does a C-Array have a wrong sizeof() value when it’s passed to a function? [duplicate]
  5. How can I find the number of elements in an array?
  6. How to get the string size in bytes?
  7. Getting the size of a malloc only with the returned pointer
  8. C – SizeOf Pointers
  9. C pointers and arrays/ ‘sizeof’ operator [duplicate]
  10. How to find the size of an array (from a pointer pointing to the first element array)?
  11. Access struct members as if they are a single array?
  12. Reliably determine the number of elements in an array
  13. C programming: array not have any bound [duplicate]
  14. How to resolve a variable for char length? [closed]
  15. C pointer to array/array of pointers disambiguation
  16. Create a pointer to two-dimensional array
  17. Dynamic allocation of an unknown matrix in C
  18. typedef fixed length array
  19. “error: assignment to expression with array type error” when I assign a struct field (C)
  20. Is this a pointer to a pointer of the start of an array?
  21. Is `*((*(&array + 1)) – 1)` safe to use to get the last element of an automatic array?
  22. Strange array initialize expression?
  23. size of array in c
  24. Segmentation Fault While Creating Large Arrays in C
  25. Using sizeof on arrays passed as parameters [duplicate]
  26. “int *nums = {5, 2, 1, 4}” causes a segmentation fault
  27. Can you resize a C++ array after initialization? [duplicate]
  28. Why is this array having all remaining values initialized to zero?
  29. What decides the sizeof an integer?
  30. How can I malloc a struct array inside a function? Code works otherwise

Leave a Comment