Different ways of writing the “if” statement [closed]

Answer 1

None of the above.

If my execution block only has one line (even if it's a huge for statement) then I don't use braces, but I do indent it, similar to #3

if (num > 3)
     print "num is greater than 3";
else
     print "num is not greater than 3";

An example with multiple statements that do not need curly braces:

if (num > 3)
    for (int i = 0; i < 100)
        print i + "\n";
else
    print "booya!";

That said, Jon Skeet's response in this question is the best