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He did not write any code.assembly is what your code is translated into before some other stages in order to be runned.There he executed the proram.These are addresses 0x0000000100000b6e.The 0x...

Just run it and got a 0 at the output.

Well by default the compiler will do so,but many things are done by default,but i think is good practice to clearly state what we want to do,and not letting someone else who read our code to 'trying'...

Before becoming a hacker try to write main this way


int main(void)
{
....
return 0;//successfully terminated program
}