[[ $var =~ ^-?[0-9]+$ ]] The ^ indicates the beginning of the input pattern The – is a literal “-“ The ? means “0 or 1 of the preceding (-)” The + means “1 or more of the preceding ([0-9])” The $ indicates the end of the input pattern So the regex matches an optional … Read more
Another alternative is to check the fractional part: x%%1==0 or, if you want to check within a certain tolerance: min(abs(c(x%%1, x%%1-1))) < tol
From the PHP manual: The size of an integer is platform-dependent, although a maximum value of about two billion is the usual value (that’s 32 bits signed). PHP does not support unsigned integers. Integer size can be determined using the constant PHP_INT_SIZE, and maximum value using the constant PHP_INT_MAX since PHP 4.4.0 and PHP 5.0.5. … Read more
For example: To generate 8 unique random numbers and store them to an array, you can simply do this: var arr = []; while(arr.length < 8){ var r = Math.floor(Math.random() * 100) + 1; if(arr.indexOf(r) === -1) arr.push(r); } console.log(arr);
You would call myBigDecimal.intValueExact() (or just intValue()) and it will even throw an exception if you would lose information. That returns an int but autoboxing takes care of that.
Provided that you can use .NET 3.5 (or newer) and LINQ, try int sum = arr.Sum();
To do this, you will use the % (mod) operator. int number; // = some int while (number > 0) { print( number % 10); number = number / 10; } The mod operator will give you the remainder of doing int division on a number. So, 10012 % 10 = 2 Because: 10012 / … Read more
if i.between?(1, 10) do thing 1 elsif i.between?(11,20) do thing 2 …
The primitive data types prefixed with “u” are unsigned versions with the same bit sizes. Effectively, this means they cannot store negative numbers, but on the other hand they can store positive numbers twice as large as their signed counterparts. The signed counterparts do not have “u” prefixed. The limits for int (32 bit) are: … Read more
One reason to declare constants in a multiplicative way is to improve readability, while the run-time performance is not affected. Also, to indicate that the writer was thinking in a multiplicative manner about the number. Consider this: double memoryBytes = 1024 * 1024 * 1024; It’s clearly better than: double memoryBytes = 1073741824; as the … Read more