compile with gcc, ./a.out: "Segmentation fault (core dumped)"

compile with clang, ./a.out: runs and fails.

compile with cc, ./a.out: Alternated between "Error: Too many arguments" and "Segmentation fault"...

ffs I'm done for the week I guess.
The problem is not that it fails, the problem is that it alternates because of time of compilation, power consumption, random blody oracles or the phase of the moon in a leap year on a Friday the 13th. God.Please.Send.~Nudes~. Help.