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C# C# Basics (Retired) Perform Order of Operations

8*(7+8)%5+6/2=

solve of this equetion

4 Answers

Steven Parker
Steven Parker
216,136 Points

What's important here is operator precedence. Jonathan mentioned the mnemonic phrase often used to indicate the order, but he forgot to apply it himself. The P ("Please") stands for parentheses, which always must be performed first.

Adrian added extra parentheses to indicate the evaluation order. This is sometimes done in actual code to make the evaluation easier to understand later (or sometimes for safety when the coder forgets the precedence rules!).

Alan got the right answer even though the steps were not quite right. The actual steps are:

  1. [P (and A)] (7 + 8) = 15
  2. [M] 8 * 15 = 120
  3. [D] 120 % 5 = 0 (% has the same precedence as /)
  4. [D] 6 / 2 = 3
  5. [A] 0 + 3 = 3

M (multiply) and D (divide) actually have the same precedence, but operators of the same precedence are performed left-to-right, so in this case, step 2 is the multiply.

Ah, yes. you are correct Steven. I clicked the view quiz button and based my answer off the first question which was 8 * 7 + 8 % 5 + 6 / 2 I should have paid closer attention.

Alan Ayoub
Alan Ayoub
40,293 Points

Nice, excellent explanation.

Adrian Clare
Adrian Clare
7,853 Points

Hi,

The answer is 3. ((8* (7+8)) %5) + (6/2) = 3

Alan Ayoub
Alan Ayoub
40,293 Points

ok, follow me here.

8*(7+8)%5+6/2=

Step 1: (7+ 8) = 15

Step 2: 15 % 5 = 0

So now we have:

8 * 0 +6/2=

Step 3: 8 * 0 = 0

Step 4: 0 + 6/2 = 3

Answer = 3

The answer is 62 If you're having trouble try copying the equation and paste it into repl remember to always keep in mind int and double... And remember "Please Excuse My Dear Aunt Sally" for the order of operations.... ;)

(Edit: See Steven Parker's answer... 62 is the first question's answer... Parentheses make all the difference!)