Python development [Article 1] string formatting Based on Python, Article 1 python
String formatting
There are two ways to format Python strings: percent and format.
The percent sign method is relatively old, while the format method is relatively
Filters (filter), hence the name Incredibles, the source data through the specific rules, converted to the required data format, this rule, we collectively referred to as filters.The filter function of the AngularJs is very powerful and easy to use.
There are many floating point number processing functions in php, including ceil, floor, round, and intval. After they are processed, they can return the expected floating point decimal places, next I will introduce some usage and Problem Analysis
The difference between the Ceil,floor,round,intval function of PHP's rounding function1, ceil-into a method to take the wholeDescriptionfloat ceil (float $value)Returns the next integer not less than value, in which value is entered if there is a
Solution Objective: Division of a number to take an integer
1.round-rounding of floating-point numbers float Round (float $val [, int $precision])Returns the result of rounding Val based on the specified precision precision (number of digits
There are many important functions in thinkphp, most of which are single-letter functions that play a significant role in the development experience.There is a saying is very incisive: concentrated is the essence! This is definitely TP's single
Ceil is a function that returns a value in the ascending order;Floor is a function used to remove the decimal places to get a value;Round is a rounding function.
CeilDefinition and usage:The ceil () function rounds up to the nearest integer.Copy
Ceil-integer in one methodDescriptionFloat ceil (float value)Returns the next integer of no less than value. If the value has a decimal part, it is entered in one place. The type returned by ceil () is still float, because the float value range is
We often use the need for rounding in actual coding. Today we will introduce some details for you.
PHP floating point type Integer ceil -- one method integerDescriptionFloat ceil (float value)Returns the next integer of no less than value. If the
I. php floating point usagePHP floating point type integer ceil-one method integerDescriptionFloat ceil (float value)Returns the next integer of no less than value. If the value has a decimal part, it is entered in one place. The type returned by
Decimal Example:
PHP reserved two decimal places and rounded
Copy the Code code as follows:$n = 0.1265489;Echo sprintf ("%.2f", $n); 0.13
As you can see, we used the sprintf function to format the $n%.2f is the target format, where 2 means that two-
1,math () function(1) ABS () #取绝对值(2) Pow (A, b) #a **b(3) round () #返回最接近的整数, if similar, returns an even numberRound (4.5) 4 round (5.5) 62. Three types of strings"" "" #描述字符串"'" #描述单个字符"" "" "" "" #处理段落字符串2). Strings can only be added to
When you encounter a situation in PHP that requires the results of division to be rounded, you need to use the following methods:1. Round: RoundingThe round () function rounds a floating-point number.Syntax: Round (x, PREC)
PHP takes integer functions commonly used four methods, the following collection of four functions, often used to take the whole function, a small sum today! Actually very simple, is just a few functions ~ ~ mainly:Ceil, Floor,round,intvalPHP Four
A, percent of the way
%[(name)][flags][width]. [Precision]typecode
(name) optional, used to select the specified key
Flags are optional, and the values to choose from are:
+ Right-aligned, positive plus, negative
At the HPE Training Center, I met the problem of asking for cube root, and here we do some algorithmic notes,Analysis Process:The cubic root of the number n is n=i*i**i, so we will think of the method first. Static double g32 (double// simple
In the Uitextfield of the input amount, three rules should be judged.1. only numbers can be entered (by setting the keyboard type to decimal pad)2. The decimal point can only have one3. up to two digits after the decimal point (can be judged by
1 //add a comma to every 3 bits for all the digital amounts, example: 888,888,888.82 3 //The following is a clean dry:4 5 functionformatnum (str) {6 7 varNewstr = "";8 9 varCount = 0;Ten One A - if(Str.indexof (".") ==-1){ - the
1. The date of the command to display dates:Date May 24, 2015 Sunday 16:23:05 CSTDate +%y/%m/%d, 2015/05/24Date +%h:%m 16:262. Display the command CAL for the calendar:Cal,cal 2015,cal 3 20153. Calculator: BC:Scale=3 three digits after decimal
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