![]() ![]() With the misplaced parenthesis in Swift the multiplication and division all operate on floating-point values. With that correction in both languages the multiplication and division all operate on integers, and integer division is truncating (e.g. Which applies the cast to Int(a) / 360 * 360 just as the Objective-C does. What you should have written is: a - Double(Int(a) / 360 * 360) Which isn't the same, here the cast only applies to Int(a). ![]() What you've written in Swift is: a - Double(Int(a)) / 360 * 360 Note that the (double) cast applies to the result of the expression (int) a / 360 * 360. The Cocoa Pods dependency manager provides additional libraries to compensate for the limited number of mature Swift libraries, and also simplifies implementations, defines dependencies and manages updates over time. Is parsed as: a - (double) ( (int) a / 360 * 360 ) In general, Swift relies on the Objective-C runtime library which enables C, C++ Objective-C and Swift code to all run seamlessly within one program. The few years before Swift’s introduction brought a lot of improvements that should keep Objective-C usable until most of us move to Swift. That’s neither surprising nor unreasonable, but fortunately, Objective-C is pretty mature. What this means is your Objective-C: a - (int) a / 360 * 360 Marco Arment: Swift has effectively stopped development of Objective-C as a language. In arithmetic expressions operators are evaluated according to a priority, relevant to your problem casts bind tightly to the following expression, multiplication and division is done next, then addition and subtraction. The only mistake you have made is in parsing the Objective-C and hence producing the wrong Swift or you've simply mis-typed the Swift. You have also understood that converting from an integer to a floating-point value differs in the two languages, in Objective-C (and C and lots of other languages) the conversion is implicit whereas in Swift it is explicit. You've just made a simple grouping error.Īs you figured out both Objective-C and Swift require a cast when converting from a floating-point value to an integer one, so you have written (int)a for the former and Int(a) for the latter. Since a is Double, the only way to interpret 360 is that it must also be a Double. Swift tries to prevent this confusion by forcing all operands to be of the same data type.You just have to be careful when mixing numeric types in C. Is there a way to know the share/trend between objective-c and swift Is Apple release any statistics like the number of apps developed using objective c. I don't know the exact internal workings of the ObjC compiler.In both cases, the compiler has some leeways in interpreting the literal constant of 360: it can be seen an int or double. Objective-C inherits type promotion rules from C, which can be a lot to remember. Let's break down how your code works in both languages: Objective-CĪssuming a = 23492.4852: a - (int) a / 360 * 360 = a - ((int) a) / 360 * 360 In integer division, the fractional part is ignored. The following article gives an insight into the differences between Objective-C and Swift programming languages. ![]()
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