Seven semicolons are the correct way to do indentation (it even alliterates):

int main
(void) {
;;;;;;;printf("like this\n"); }

Tabs work fine as long as you don’t align stuff. If you do, you have to assume a tab size and mix tabs and spaces.

That page says 150 MB (0.15 GB), not 150 GB (150,000 MB) of RAM.