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Why malloc+memset is slower than calloc?
...en though it is already filled with zeroes. This is an enormous amount of extra work, and explains why calloc() is faster than malloc() and memset(). If end up using the memory anyway, calloc() is still faster than malloc() and memset() but the difference is not quite so ridiculous.
This doesn'...
fastest MD5 Implementation in JavaScript
...mple interface.
So if you want to calculate the MD5 hash of your password string then do as follows:
<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.9-1/core.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/3.1.9-1/md5.js"></script&...
Explain the concept of a stack frame in a nutshell
... instructions to save, set up and restore frame pointers; it also makes an extra register available in many functions)
Intel C++ Compiler have the following:
-fomit-frame-pointer (Determines whether EBP is used as a general-purpose register in optimizations)
which has the following alias:
/O...
Checking for an empty field with MySQL
...
An empty field can be either an empty string or a NULL.
To handle both, use:
email > ''
which can benefit from the range access if you have lots of empty email record (both types) in your table.
...
How to have a default option in Angular.js select box
...
@BenLesh If i want to write some text(string) instead of first option.ng-init="somethingHere= somethingHere || 'Select one' " i tried like this. but it didn't work. what is wrong in my code
– codelearner
Mar 28 '16 at 7:01
...
How to select the last record of a table in SQL?
...
to get the last row of a SQL-Database use this sql string:
SELECT * FROM TableName WHERE id=(SELECT max(id) FROM TableName);
Output:
Last Line of your db!
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improv...
Select distinct using linq [duplicate]
...he ID:
public class LinqTest
{
public int id { get; set; }
public string value { get; set; }
public override bool Equals(object obj)
{
LinqTest obj2 = obj as LinqTest;
if (obj2 == null) return false;
return id == obj2.id;
}
public override int GetHa...
lexers vs parsers
...language pieces they find.
Lexers attach meaning by classifying lexemes (strings of symbols from the input) as the particular tokens. E.g. All these lexemes: *, ==, <=, ^ will be classified as "operator" token by the C/C++ lexer.
Parsers attach meaning by classifying strings of tokens from the ...
How can strings be concatenated?
How to concatenate strings in python?
7 Answers
7
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Factors in R: more than an annoyance?
... of why they're a pain is because in read.table and read.csv, the argument stringsAsFactors = TRUE by default (and most users miss this subtlety). I say they are useful because model fitting packages like lme4 use factors and ordered factors to differentially fit models and determine the type of con...