Pro tip: the arguments to main() don’t have to be named argc and argv.

Also, you forgot to #define an alias for atoi, and number, n, and i could’ve been named something more on fleek.

Reminds me of lolcode:

HAI 1.2
CAN HAS STDIO?
PLZ OPEN FILE "LOLCATS.TXT"?
    AWSUM THX
        VISIBLE FILE
    O NOES
        INVISIBLE "ERROR!"
KTHXBYE