Why memset works for -1 but not for 5?

Question

https://code.sololearn.com/cg7YyS9Sozu4/?ref=app

Answer 1

memset sets each byte to the byte n.

An int has 4 bytes on a non 16-bit machine so it gets the byte "0000 0101" (5) 'encoded' in it 4 times.

"0000 0101 0000 0101 0000 0101 0000 0101" = 84 215 045

It just so happens to work with -1 because
"1111 1111 1111 1111 1111 1111 1111 1111" = -1

Answer 2

Hatsy Rei KrOW ChillPill Gordon Mirielle pls help

Answer 3

Thanks Dennis