It's not a matter of different options being accepted but what has transpired. A grocery store is perfectly capable of taking back your groceries if you're unable to pay for them. So I guess what I'm saying is moot.
Depending on the region its likely fine to only accept card for goods being offered.
However it's not fine to only accept cards in a scenario of debt. (The idea you've consumed or changed something before paying)
So even with all this signage if the pump allows you to pump before payment. You'll need to accept cash as the business or be willing to provide them an invoice to be paid out later through the banks.
You might argue that the fuel is in the tank just take it back. However, this will not be the same fuel that is being sold. As it's now had an opportunity to be contaminated by whatever was in the vehicles tank. Taking that contaminated fuel and putting it back in the main holding tank would potentially be considered as fraud.
Edit: so many labels I thought I was looking at a gas station self serve haha not a grocery store.
This book helps teach you programming and understanding systems at a low level. While trying to be entertaining and provides a liveCD to experiment with.
Possibly I was fairly young at the time so I don't remember it well. But it was great that it worked. We all brought our xboxes to our Friends place who had the internet. Rare at the time where I was and we used that tool to take on the world as a small team. I remember their older brother was supervising us and helped get everything working.
So it depends. For example some legacy apple stuff had a bad DHCP implementation where it would try to hold onto an IP address it had before.
When there's one DHCP server with a reserved ip it won't assign that ip to the wrong device. (Unless you're running some buggy software that takes your configuration as suggestions)
Where the advice to set it anyways comes from scenarios where that DHCP server goes down for long enough that everyone starts self assigning addresses. It's a real hassle to find the correct system when that happens.
Specifically ANSI C. All those new hipster features will never catch on.