memset function in c language

Question

I am studying the memset function now, but all the examples are regarding to char array as following:

char a[100];
memset(a, 0, 100);

it will s

Answer 1

For static-sized and variable-length arrays, you can just

  foo [...];
memset (foo, 0, sizeof (foo)); // sizeof() gives size of entity in bytes

Rule of thumb: Never hardcode [data sizes].

(This does not work if you pass arrays as function arguments: Behaviour of Sizeof in C )