conditional-statements – Page 5

Why would a language NOT use Short-circuit evaluation?

August 7, 2023 by Tarik

Reasons NOT to use short-circuit evaluation: Because it will behave differently and produce different results if your functions, property Gets or operator methods have side-effects. And this may conflict with: A) Language Standards, B) previous versions of your language, or C) the default assumptions of your languages typical users. These are the reasons that VB … Read more

Conditional Statements in PHP code Between HTML Code

August 4, 2023 by Tarik

Ansible: check if variable equals string

August 1, 2023 by Tarik

Be careful with a variable called environment, it can cause problems because Ansible uses it internally. I can’t remember if it’s in the docs, but here’s a mailing list thread: https://groups.google.com/forum/#!topic/ansible-project/fP0hX2Za4I0 We use a variable called stage. It looks like you’ll end up with a bunch of these in a row: – include_vars: testing_vars.yml when: … Read more

C error: Expected expression before int

July 31, 2023 by Tarik

This is actually a fairly interesting question. It’s not as simple as it looks at first. For reference, I’m going to be basing this off of the latest C11 language grammar defined in N1570 I guess the counter-intuitive part of the question is: if this is correct C: if (a == 1) { int b … Read more

Check if a condition is false

July 30, 2023 by Tarik

Do you mean: if ! [ 0 == 2 ]; then echo Hello; fi You lacked space around the equality operator. This might be the time to read http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html – especially the sections about if then else and operators. I usually have this open when I am writing scripts..

Assignment Condition in Python While Loop

July 30, 2023 by Tarik

Starting Python 3.8, and the introduction of assignment expressions (PEP 572) (:= operator), it’s now possible to capture an expression value (here sys.stdin.read(1)) as a variable in order to use it within the body of while: while (i := sys.stdin.read(1)) != ‘\n’: do_smthg(i) This: Assigns sys.stdin.read(1) to a variable i Compares i to \n If … Read more

SELECT query with CASE condition and SUM()

July 29, 2023 by Tarik

Select SUM(CASE When CPayment=”Cash” Then CAmount Else 0 End ) as CashPaymentAmount, SUM(CASE When CPayment=”Check” Then CAmount Else 0 End ) as CheckPaymentAmount from TableOrderPayment Where ( CPayment=”Cash” Or CPayment=”Check” ) AND CDate<=SYSDATETIME() and CStatus=”Active”;