How to have multiple and statements in c#

Question

I am making a frequency analysis thingy, and I want it to automatically switch letters. I know what to switch to, but can you have your code like:

if(a > b && a > c && a > c) { //code }

I have been told that it won't evaluate the rest of the code, if a > b. Is that true?

It won't evaluate if `a < b`, not the other want around. It's called short-circuiting. — , Apr 06 '14 at 09:38

score 1 · Accepted Answer · answered Apr 06 '14 at 09:49

When .Net computes && it uses short-circuiting: it checks the first expression (a > b) and if it false does nothing, in case of true checks the second (a > c) etc., so your case

  if(a > b && a > c && a > d) { //code }

is equal to

  if (a > b) 
    if (a > c)
      if (a > d) { //code }

score 0 · Answer 2 · answered Apr 06 '14 at 09:38

0

if(a > b && a > c && a > c)

if a > b is false then it won't validate a > c. As both has to be true in order for the code to be executed. However if a > b is true, then it will check a > cas well.

Also, it makes no sense to have a > c two times.

If just one of the comparisons has to be true, you can use the || operator.

answered Apr 06 '14 at 09:38

Peter Rasmussen

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Thanks, didn't mean to add that in. Imagine the second c as a d. – cabarclay Apr 06 '14 at 09:40
I had a feeling that was the case :) Just wanted to point it out. – Peter Rasmussen Apr 06 '14 at 09:40

score 0 · Answer 3 · edited May 23 '17 at 12:20

actually this is called the short-circuit evaluation where different statements have AND operator between them the C# run-time will evaluate the whole expression to false if one statement is false then ignores the rest of the statements evaluation.

if you want the to evaluate all the expressions regardless of the result of each one alone then use single & rather then two &&. it will compare them bit wise and it will enforce to evaluate all the statements to determine the final result.

if(a > b && a > c && a > c)

instead

if(a > b & a > c & a > c)//it will evaluate all the conditions before the final result

For more check this: LINK

How to have multiple and statements in c#

3 Answers3