Why is PHP printing my number in scientific notation, when I specified it as .000021?
Use number_format() to get what you’re after: print number_format($var, 5); Also check sprintf()
numbers
Why does Array.filter(Number) filter zero out in JavaScript?
Because 0 is one of the many falsy values in javascript All these conditions will be sent to else blocks: if (false) if (null) if (undefined) if (0) if (NaN) if (”) if (“”) if (“) From the Array.prototype.filter() documentation: filter() calls a provided callback function once for each element in an array, and constructs … Read more
How to read values from numbers written as words?
I was playing around with a PEG parser to do what you wanted (and may post that as a separate answer later) when I noticed that there’s a very simple algorithm that does a remarkably good job with common forms of numbers in English, Spanish, and German, at the very least. Working with English for … Read more
Octal number literals: When? Why? Ever? [closed]
I recently had to write network protocol code that accesses 3-bit fields. Octal comes in handy when you want to debug that. Just for effect, can you tell me what the 3-bit fields of this are? 0x492492 On the other hand, this same number in octal: 022222222 Now, finally, in binary (in groups of 3): … Read more
php: number only hash?
An MD5 or SHA1 hash in PHP returns a hexadecimal number, so all you need to do is convert bases. PHP has a function that can do this for you: $bignum = hexdec( md5(“test”) ); or $bignum = hexdec( sha1(“test”) ); PHP Manual for hexdec Since you want a limited size number, you could then … Read more
Double multiplied by 100 and then cast to long is giving wrong value
None of the answers seem to deal with why 17.32 acted different. 1. Why it occurred The difference in behaviour you see between 17.32 and 17.33 & 17.31 is due to IEEE-754 Rounding rules. Rounding rule applied: from, The Java™ Virtual Machine Specification §2.8.1 The rounding operations of the Java virtual machine always use IEEE … Read more
Is there a way to write a large number in C++ source code with spaces to make it more readable? [duplicate]
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)
How to label scatterplot points by name?
Well I did not think this was possible until I went and checked. In some previous version of Excel I could not do this. I am currently using Excel 2013. This is what you want to do in a scatter plot: right click on your data point select “Format Data Labels” (note you may have … Read more
Format a number with leading sign
Use a negative subpattern, as described in the javadoc for DecimalFormat. DecimalFormat fmt = new DecimalFormat(“+#,##0.00;-#”); System.out.println(fmt.format(98787654.897)); System.out.println(fmt.format(-98787654.897)); produces (in my French locale where space is the grouping separator and the comma is the decimal separator) : +98 787 654,90 -98 787 654,90
How to dismiss number pad keyboard by tapping anywhere
Declaring the text field as instance variable or property if it isn’t already and implementing a simple method like this: – (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { [textField resignFirstResponder]; } will do just fine.