Sorry if this is too noob for this forum, but I'm literally just getting started with learning how to code. I'm having a hard time figuring out the order of operations for Ruby. 25 + 30 / 6 = 30 I totally get this. It takes 25 + (30/6). 100 - 25 * 3 % 4 = 97 I get this too. It's basically taking 100 minus 4% of 75. But I can't for the life of me get this: 3 + 2 + 1 - 5 + 4 % 2 - 1 / 4 + 6 = 7 Can someone please explain this one to me? I understand that because the code isn't using a floating decimal it's going to be off. But I can't even get close to figuring out how the above comes to 7. This seems so simple that I should be able to figure it out. Maybe coding is not for me? Would really appreciate some help. Thanks.
on 2014-03-24 22:06
on 2014-03-24 23:05
Kevin Ja wrote in post #1140807: with irb : irb(main):008:0> 4 % 2 => 0 irb(main):009:0> 1 / 4 => 0 irb(main):010:0> 3+2+1-5+6 => 7 > > I understand that because the code isn't using a floating decimal it's > going to be off. that's right ! Each time you have a doubt with ruby, open an irb session and test !
on 2014-03-25 00:50
Regis d'Aubarede wrote in post #1140816: > Each time you have a doubt with ruby, open an irb session and test ! Thanks Regis! You also just showed me the irb, which I didn't even know existed or how to use it. I'm now a little worried I'll never be able to wrap my head around the way Ruby does math. So it's basically doing: 1 + 0 + 0 +6 = 7. With 1 being (3+2+1-5), 0 being (4 % 2), another 0 being (1 / 4), and the 6 being (6). Seems very strange to me. Although, I have zero programming experience, I can follow operations if brackets are used (like in Excel). I'd like to see this as: (3+2+1-5) + (4%2) - (1 / 4) + 6 = 7. And even here, the 4%2 seems backwards. But I guess there's a reason why it needs to be this way for coding. I just have to learn why. Thanks again.