For reference—future Python possibilities: Starting with Python 2.6 you can express binary literals using the prefix 0b or 0B: >>> 0b101111 47 You can also use the new bin function to get the binary representation of a number: >>> bin(173) ‘0b10101101′ Development version of the documentation: What’s New in Python 2.6
Updated answer for Swift 2.0+: toInt() method gives an error, as it was removed from String in Swift 2.x. Instead, the Int type now has an initializer that accepts a String: let a: Int? = Int(firstTextField.text) let b: Int? = Int(secondTextField.text)
This is from an interview with Gosling and others, about simplicity: Gosling: For me as a language designer, which I don’t really count myself as these days, what “simple” really ended up meaning was could I expect J. Random Developer to hold the spec in his head. That definition says that, for instance, Java isn’t … Read more
Use chr() and ord(): >>> chr(97) ‘a’ >>> ord(‘a’) 97
Use the unary + operator, which converts its operand into a number. + true; // 1 + false; // 0 Note, of course, that you should still sanitise the data on the server side, because a user can send any data to your sever, no matter what the client-side code says.
They take up different amounts of space and they have different ranges of acceptable values. Here are the sizes and ranges of values for SQL Server, other RDBMSes have similar documentation: MySQL Postgres Oracle (they just have a NUMBER datatype really) DB2 Turns out they all use the same specification (with a few minor exceptions … Read more
Unsigned can hold a larger positive value and no negative value. Yes. Unsigned uses the leading bit as a part of the value, while the signed version uses the left-most-bit to identify if the number is positive or negative. There are different ways of representing signed integers. The easiest to visualise is to use the … Read more
Using modulus will work: num % 1 != 0 // 23 % 1 = 0 // 23.5 % 1 = 0.5 Note that this is based on the numerical value of the number, regardless of format. It treats numerical strings containing whole numbers with a fixed decimal point the same as integers: ‘10.0’ % 1; … Read more
Your String-based solution is perfectly OK, there is nothing “un-neat” about it. You have to realize that mathematically, numbers don’t have a length, nor do they have digits. Length and digits are both properties of a physical representation of a number in a specific base, i.e. a String. A logarithm-based solution does (some of) the … Read more
int() is the Python standard built-in function to convert a string into an integer value. You call it with a string containing a number as the argument, and it returns the number converted to an integer: >>> int(“1”) + 1 2 If you know the structure of your list, T1 (that it simply contains lists, … Read more