Have a look at the man page for printf:
man 3 printf
It is a code for representing 128 English characters as numbers, with each letter assigned a number from 0 to 127. For example, the ASCII code for uppercase M is 77. Most computers use ASCII codes to represent text, which makes it possible to transfer data from one computer to another.
Crunchyroll or my anime list. Both of these work.
Hope this helps you
The answer is C) heater box