How to Install Older iOS Simulators in XCode 4.2.1 (SDK5.0)

X-Code 4.2 will have iOS 5 simulator and library only. If you want lower version simulator and library with X-Code just goto X-Code->Prefrences-> Downloads Tab. In downloads tab you’ll have two tabs: 1) Components – Here you will have option to download iOS 4.3 simulator(~600 Mb), iOS 4.0-4.1(~670 MB) Device debugging support, iOS 3.0-3.2.2(686.3 MB) … Read more

Why does adding two decimals in Javascript produce a wrong result? [duplicate]

It’s not a JS problem but a more general computer one. Floating number can’t store properly all decimal numbers, because they store stuff in binary For example: 0.5 is store as b0.1 but 0.1 = 1/10 so it’s 1/16 + (1/10-1/16) = 1/16 + 0.0375 0.0375 = 1/32 + (0.0375-1/32) = 1/32 + 00625 … … Read more

Concatenation with addition in it doesn’t work as expected

+ and . have the same operator precedence, but are left associative. Means after the first concatenation: ‘(‘ . (int)$data[‘event_id’] The string got added with your key, e.g. “($data[‘event_id’]” + $key So the string gets converted into an integer in that numerical context and disappears. To solve this use parentheses () around your addition.

Adding binary numbers

Use Integer.parseInt(String, int radix). public static String addBinary(){ // The two input Strings, containing the binary representation of the two values: String input0 = “1010”; String input1 = “10”; // Use as radix 2 because it’s binary int number0 = Integer.parseInt(input0, 2); int number1 = Integer.parseInt(input1, 2); int sum = number0 + number1; return Integer.toBinaryString(sum); … Read more