Why does “memset(arr, -1, sizeof(arr)/sizeof(int))” not clear an integer array to -1?

Question

Is it not possible to use memset on an array of integers? I tried the following memset call and didn\'t get the correct integer values in the

Answer 1

Why the division?

memset(arr, -1, sizeof(arr));

Your version, sizeof(arr)/sizeof(int), gives you the number of elements in the array.