SEARCH KEYWORD -- Decimal
Converting Decimal Fractions to Binary
Converting Decimal Fractions to Binary In the text proper, we saw how to convert the decimal number 14.75 to a binary representation. In this instance, we \"eyeballed\" the fractional part of the binary expansion; 3/4 is obviously 1/2 + 1/4. While this worked for this particular example, we\'ll need a more systematic approach for less obvious cases. In fact, there is a simple, step-by-step method for computing the binary expansion on the right-hand side of the point. We will illustrate the metho...
Decimal,Fractional,Binary 2011-03-19 06:45:35
Data type in MySQL
For both small free database space and large e-commerce websites, reasonable database table structure design is essential. To achieve this, it requires us to have a full understanding of commonly used data types in database system. Below we share some knowledge about data types in MySQL.1. Numeric typesThe numeric types can be classified as : integer, float and decimal type.The so-called "decimal" refers DECIMAL and NUMERIC, they are of the same type. Strictly speaking it is not a numeric type, ...
Currency list with symbols
For those who want to find out a currency code, name, symbol, numeric code and decimal numbers, below is a simple JSON structure for easy use. [{ "code": "AED", "numeric": "784", "name": "UAE Dirham", "symbol": "د.إ", "decimal": 2 }, { "code": "AFN", "numeric": "971", "name": "Afghani", "symbol": "؋", "decimal": 2 }, { "code": "ALL", "numeric": "008", "name": "Lek", "symbol": "L", "decimal": 2 }, { "code": "AMD", "numeric": "051", "name": "Arme...
JSON,REFERENCE,NUMERIC CODE,SYMBOL,CURRENCY 2021-12-03 04:38:50
Reproduce "MySQL server has gone away" in PHP
If you want to debug the issue of "MySQL server has gone away", you can reproduce it with below steps: Modify configuration file: sudo vi /etc/mysql/my.cnf Make below changes: [mysqld] wait_timeout = 30 interactive_timeout = 30 Restart the service: sudo /etc/init.d/mysql restart Write below PHP codes: $link = mysql_connect('127.0.0.1', 'root', 'root'); if (!$link)&nbs...
MySQL,debug,rMySQL server has gone away 2013-04-15 11:33:14
PHP advisory file lock : flock
When we process a file in PHP, we may often need to acquire a lock so that other scripts cannot edit the same file at the same time. There is a flock() function in PHP which can help us lock the file we want to process. But there is one issue we should take care. Recently, ffb encountered one issue while he was trying to lock a file handle. The codes are below: $filename = "/tmp/lock.txt"; $fp = fopen($filename, "r+"); if (!$fp...
flock(),advisory locking,PHP 2013-04-23 11:42:48
20 bit operations programmers should know
While talking about bit operation, programmers usually think about its efficiency. In embedded programming and system core optimization, appropriate use of bit operations is always a fascinating. When finding a job, it will help you a lot if you use bit operations when writing codes. Mastering simple bit arithmetic skills is necessary. 1. Get maximum int value int getMaxInt(){ return (1 << 31) - 1;//...
Bit operation, Tips 2012-12-19 12:53:33
How small should a function be?
"The well-designed functions are often relatively small, large function design is often a mess or there is a lot of room for optimization."Maybe you think there is no need to discuss the size of functions, because the nature of the function design is cohesive, its size is only its manifestations. But it is necessary to discuss about the size of function because the statement above .First let's understand the concept of minimum code processing unit : a basic operation (assignment, comparison, etc...
Function size,Optimization 2012-12-18 13:58:07
Why cannot compare double values directly for equality?
A question in PHP: Get some value from the database and use floatval() to convert it to floatint point value, then compare it with another value which is also converted to floating point value with floatval(). These two values are the same when using var_dump() to output, the two outputs are float(8.87), they are the same. But when comparing them for equality, the result is weird., they are not equal. Why?To analyze this question, we need to start with PHP data types. PHP uses weak types. In PHP...
PHP,floating, precision,compare,equality 2012-06-27 09:01:36
Python basics summary
Python is recommended by many people as the first language to be learned now. Even in some universities, it is the primary language to be taught to CS/CE students. To master this languages, we should understand some basics of it. Here we summarize some basics about this language. These basics include : string replacement with regular expression, traverse a directory, sort a list, remove duplication, dictionary ordering, dictionary, list, string conversion, date object manipulation, command line ...
Integer overflow
You may be familiar with integer overflow, but what you may not be familiar with is how gcc handles signed integer overflow. First let's look at the standard, for unsigned integer, the standard says : A computation involving unsigned operands can never overflow, because a result that cannot be represented by the resulting unsigned integer type is reduced modulo the number that is one greater than the largest value that can be represented by the resulting type. In other words, unsigned integer ov...
Integer overflow,gcc,Linux 2012-10-20 13:33:10
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