numbers – Make Me Engineer

How to properly format currency on ios

June 14, 2023 by Tarik

You probably want something like this (assuming currency is a float): NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init]; [numberFormatter setNumberStyle: NSNumberFormatterCurrencyStyle]; NSString *numberAsString = [numberFormatter stringFromNumber:[NSNumber numberWithFloat:currency]]; From your requirements to treat 52 as .52 you may need to divide by 100.0. The nice thing about this approach is that it will respect the current locale. … Read more

VB.net Need Text Box to Only Accept Numbers

June 14, 2023 by Tarik

You can do this with the use of Ascii integers. Put this code in the Textbox’s Keypress event. e.KeyChar represents the key that’s pressed. And the the built-in function Asc() converts it into its Ascii integer. Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress ’97 – 122 = Ascii codes for … Read more

Explanation on Integer.MAX_VALUE and Integer.MIN_VALUE to find min and max value in an array

June 13, 2023 by Tarik

but as for this method, I don’t understand the purpose of Integer.MAX_VALUE and Integer.MIN_VALUE. By starting out with smallest set to Integer.MAX_VALUE and largest set to Integer.MIN_VALUE, they don’t have to worry later about the special case where smallest and largest don’t have a value yet. If the data I’m looking through has a 10 … Read more

Is there a way to write a large number in C++ source code with spaces to make it more readable? [duplicate]

June 11, 2023 by Tarik

Try digit separator: int i = 1’000’000’000; This feature is introduced since C++14. It uses single quote (‘) as digit separator. Also see: Why was the space character not chosen for C++14 digit separators? Generalizing Overloading for C++2000 (April’s joke by the father of C++ himself)

Octal equivalent in C#

June 10, 2023 by Tarik

No, there are no octal number literals in C#. For strings: Convert.ToInt32(“12”, 8) returns 10.

Show a leading zero if a number is less than 10 [duplicate]

June 9, 2023 by Tarik

There’s no built-in JavaScript function to do this, but you can write your own fairly easily: function pad(n) { return (n < 10) ? (“0” + n) : n; } EDIT: Meanwhile there is a native JS function that does that. See String#padStart console.log(String(5).padStart(2, ‘0’));

iOS: How to get a proper Month name from a number?

June 8, 2023 by Tarik

Another option is to use the monthSymbols method: int monthNumber = 11; //November NSDateFormatter *df = [[[NSDateFormatter alloc] init] autorelease]; NSString *monthName = [[df monthSymbols] objectAtIndex:(monthNumber-1)]; Note that you’ll need to subtract 1 from your 1..12 monthNumber since monthSymbols is zero-based.

Number.sign() in javascript

June 7, 2023 by Tarik

More elegant version of fast solution: var sign = number?number<0?-1:1:0

Create a unique number with javascript time

June 7, 2023 by Tarik

A better approach would be: new Date().valueOf(); instead of new Date().getUTCMilliseconds(); valueOf() is “most likely” a unique number. http://www.w3schools.com/jsref/jsref_valueof_date.asp.

Fixed point vs Floating point number

June 6, 2023 by Tarik

A fixed point number has a specific number of bits (or digits) reserved for the integer part (the part to the left of the decimal point) and a specific number of bits reserved for the fractional part (the part to the right of the decimal point). No matter how large or small your number is, … Read more