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Best way to display decimal without trailing zeroes
...g[] args)
{
var dList = new decimal[] { 20, 20.00m, 20.5m, 20.5000m, 20.125m, 20.12500m, 0.000m };
foreach (var d in dList)
Console.WriteLine(d.ToString("0.#####"));
}
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How to find time complexity of an algorithm
... // O(1)
a = 10; // O(1)
a = 1.000.000.000.000.000.000 // O(1)
2 - If then else statement: Only taking the maximum running time from two or more possible statements.
Example:
age = read(x) // (1+1) = 2
if age < ...
How to automatically reload a page after a given period of inactivity
...
function refresh() {
if(new Date().getTime() - time >= 60000)
window.location.reload(true);
else
setTimeout(refresh, 10000);
}
setTimeout(refresh, 10000);
</script>
...
Hash and salt passwords in C#
...
* Version 3:
* PBKDF2 with HMAC-SHA256, 128-bit salt, 256-bit subkey, 10000 iterations.
* Format: { 0x01, prf (UInt32), iter count (UInt32), salt length (UInt32), salt, subkey }
* (All UInt32s are stored big-endian.)
*/
public string HashPassword(string password)
{
var prf = KeyDerivatio...
Should I use a data.frame or a matrix?
...
@Michal: Matrices aren't really more memory efficient:
m <- matrix(1:400000, 200000, 2)
d <- data.frame(m)
object.size(m)
# 1600200 bytes
object.size(d)
# 1600776 bytes
... unless you have a large number of columns:
m <- matrix(1:400000, 2, 200000)
d <- data.frame(m)
object.size(m)
...
Guid.NewGuid() vs. new Guid()
...
new Guid() makes an "empty" all-0 guid (00000000-0000-0000-0000-000000000000 is not very useful).
Guid.NewGuid() makes an actual guid with a unique value, what you probably want.
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Get hours difference between two dates in Moment Js
...time in nice human readable form, like this:
moment('2019-04-30T07:30:53.000Z').fromNow() // an hour ago || a day ago || 10 days ago
Or if you want that between two specific dates you can use:
var a = moment([2007, 0, 28]);
var b = moment([2007, 0, 29]);
a.from(b); // "a day ago"
Taken from ...
How do I format a number with commas in T-SQL?
...onstrates adding commas:
PRINT FORMATMESSAGE('The number is: %s', format(5000000, '#,##0'))
-- Output
The number is: 5,000,000
Demo 2
Demonstrates commas and decimal points. Observe that it rounds the last digit if necessary.
PRINT FORMATMESSAGE('The number is: %s', format(5000000.759145678, '#...
Cosmic Rays: what is the probability they will affect a program?
...ors in the Wild: A Large-Scale Field Study" says that there can be up to 25000-75000 one-bit FIT per Mbit (failures in time per billion hours), which is equal to 1 - 5 bit errors per hour for 8GB of RAM after my calculations. Paper says the same: "mean correctable error rates of 2000–6000 per GB p...
C# - What does the Assert() method do? Is it still useful?
...stem assumes that a customer-information
file will never have more than 50,000 records, the program might
contain an assertion that the number of records is less than or equal
to 50,000. As long as the number of records is less than or equal to
50,000, the assertion will be silent. If it encounters ...