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An IF statement is executed based on the occurrence of a certain condition. IF statements must begin with the keyword IF and terminate with the keyword END.
There are three forms of IF statements: IF-THEN , IF-THEN-ELSE , and IF-THEN-ELSIF . The simplest form of IF statement associates a Boolean expression with a sequence of statements enclosed by the keywords THEN and END IF . The sequence of statements is executed only if the expression returns TRUE .
An if statement is written with the if keyword, followed by a condition in parentheses, with the code to be executed in between curly brackets. In short, it can be written as if () {} .
For cases like this, there's also the conditional operator:
output = (val % 2 == 1) ? "Number is odd" : "Number is even";
If you're definitely going to use an "if" I'd use version 2 or version 4, depending on the rest of your bracing style. (At work I use 4; for personal projects I use 2.) The main thing is that there are braces even around single statements.
BTW, for testing parity it's slightly quicker to use:
if ((val & 1) == 1)
Version 2. I always include the brackets because if you ever need to put more than one line under the conditional you won't have to worry about putting the brackets in at a later date. That, and it makes sure that ALL of your if statements have the same structure which helps when you're scanning code for a certain if statement.
I use version 2.
One reason to use curly braces becomes more clear if you don't have an else.
if(SomeCondition)
{
DoSomething();
}
If you then need to add another line of code, you are less likely to have an issue:
if(SomeCondition)
{
DoSomething();
DoSomethingElse();
}
Without the braces you might have done this:
if(SomeCondition)
DoSomething();
DoSomethingElse();
I personally prefer 3. The extra curly braces just add too much unnecessary visual noise and whitespace.
I can somewhat see the reasoning for 2/4 to reduce bugs, but I have personally never had a bug because thinking extra lines were inside an if statement. I do use C# and visual studio so my code always stays pretty well formatted. This could however be a problem if I was a more notepad style programmer.
I prefer #2. Easy readability.
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