Javascript rounding method summary, javascript rounding
The rounding function toFixed (n) in native javascript, where n is the number of decimal places to be retained. (0
Copy codeThe Code is as follows:Var num = 1.0999;Console. log (num. toFixed (20 ));
Http://jsfiddle.net/14x0vhu6/
The output value is not the expected 1.0999, but 1.09990000000000009983. Yo
php to take the integer function commonly used in four ways:
1. Direct rounding, discard decimals, keep integers: intval ();2. Rounded rounding: round ();3. Take the whole up, there are decimals plus 1:ceil ();4. Take the whole down: floor ().
One, intval-to the variable to the integer formIntval is automatically converted to 0 if it is a character type.
Intval (3.14159); 3
intval (3.64159); 3
intval (
PHP rounded to exact decimal places and rounded up. In php, functions such as sprintf, ceil, floor, and round are used to perform rounding. let's take a look at the specific instance. In this article, we will use php to perform four functions in php to take decimal places: sprintf, ceil, floor, round, and so on. let's take a look at the specific example.
This article will use php to round the number and retain N decimal places, and use php to round th
PHP floating point calculation comparison and rounding inaccurate solution, rounding inaccurate
PHP interesting phenomenon, it should be a lot of programming languages will have this phenomenon. This is because the computer itself on the problem of floating point recognition .....
[PHP]View Plaincopy
$f = 0.58;
Var_dump (intval ($f * 100 *100)); //Result 5799
Var_dump (float) ($f * 100 *100))
Math.Abs ()//math.abs (x) x any value returns absolute valuesMath.ceil ()//math.ceil (x) rounded up, roundedMath.Cos ()//cosineMath.floor ()//math.floor (x) rounding downMath.max ()//Math.max (... arg) 0 or more parameters return the largest oneMath.min ()//Math.min (... arg) 0 or more parameters return the smaller oneMath.pow ()//math.pow (2,3) 2 of three-time squareMath.random ()//returns a random number between 0.0-1.0Math.sqrt ()//math.sqrt (x) x>
In php, functions such as sprintf, ceil, floor, and round are used to perform rounding. Let's take a look at the specific instance.
This article will use php to round the number and retain N decimal places, and use php to round the number.
(1) php keeps three decimal places and rounding them
The Code is as follows:
Copy code
$ Num = 0.0215489;Echo sprintf ("%. 3f", $ num); // 0.022
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 $n%.2f is the target format, where 2 means that two-bit f means float (floating-point) 3rd is a decimal 6 is roundedLet's look at an example.
Copy the Code code as follows:$n =0.1265489Echo substr (sprintf ("%.3", $n), 0,-1);//0.12
The code outputs a reserved 2 for decimals without
Package valuetest;
public class Double2int {
/**
* @param args
*
/public static void main (string[] args) {
double D = 5.5;
int i = (int) d;
System.out.println (i);
D = 5.9;
i = (int) d;
System.out.println (i);
D = 5.2;
i = (int) d;
System.out.println (i);
Replace with uppercase double
double d1 = new double (5.5);
int i1 = D1.intvalue ();
Sy
1. In C #:--math.ceiling (double), which returns the largest integer greater than or equal to the specified double-precision floating-point number (also known as the take-up of the day plate value);eg: Math. Ceiling (1.01) = 2; Math. Ceiling (1.37) = 2;--math.floor (double), which returns the largest integer less than or equal to the specified double-precision floating-point number (also known as the fetch floor value);eg: Math. Floor (1.99) = 1; Math. Floor (1.87) = 1;In 2.Oracle:Take the i
PHP to take the decimal place function has sprintf,ceil,floor,round and so on functions to achieve rounding, let's look at the specific example.
This article will use PHP to round up numbers to preserve n decimal places, and a small summary of how numbers are rounded using PHP.
(1) PHP reserved Three decimal places and rounded
The code is as follows
Copy Code
$num = 0.0215489;Echo sprintf ("%.3f", $num); 0.022
(2)
Php keeps two decimal places and rounding themCopy codeThe Code is as follows:$ Num = 123213.666666;Echo sprintf ("%. 2f", $ num ); Php keeps two decimal places and does not roundCopy codeThe Code is as follows:$ Num = 123213.666666;Echo sprintf ("%. 2f", substr (sprintf ("%. 3f", $ num), 0,-2 )); Php returns an integerCopy codeThe Code is as follows:Echo ceil (4.3); // 5Echo ceil (9.999); // 10 Php rounding
Mode one: BigDecimal way
Double F = 3.1315;
BigDecimal B = new BigDecimal (new Double (f). toString);
Double f1 = B.setscale (3, bigdecimal.round_half_up). Doublevalue ();
Note: There must be no direct use of the new BigDecimal (double) construction method.
Instead of using the new BigDecimal (1.1315). ToString (), there will be an exact problem
Mode two: DecimalFormat way
DecimalFormat By default Roundingmode.half_even this type, and the result after format is a string
DecimalFormat df = ne
The WPS table has a function is that we enter some numbers in the table will find that if a decimal point will automatically kill the decimal, then how do we cancel this function? Let's take a look at the WPS table to cancel the rounding method, I hope the example can help you.
The setting is very simple as long as we make a setting in the cell format.
1, we open to deal with the WPS table, and then we select the cell face click on the pop-up menu c
This article will use PHP to round up the numbers to keep n decimal digits, as well as using PHP for the number of rounding method to do a small sum.
(1) PHP retains three decimal places and rounded
The code is as follows
Copy Code
$num = 0.0215489;Echo sprintf ("%.3f", $num); 0.022
(2) PHP keep three decimal digits not rounded
The code is as follows
Copy Code
$num = 0.0215489;Echo
650) this.width=650; "src=" Http://s1.51cto.com/wyfs02/M00/85/DE/wKioL1etMTKR6J7EAAJ3F9APqj8826.jpg "title=" 710-420.jpg "alt=" Wkiol1etmtkr6j7eaaj3f9apqj8826.jpg "/>The four-year-old Olympic Games are Rio in full swing, and Chinese Olympic athletes are vying for the highest glory of the Olympic Games. In this 8 months of national Carnival , in addition to the Chinese Olympic athletes refueling, applause, of course, there is a passionate prize quiz! P
TopicIf you are a geography teacher with 35 students in your class, you want to take a quiz in the capitals of the U.S. state. Unfortunately, there are a few bad guys in the class, and you can't be sure that students won't cheat. You want to randomly adjust the order of the questions so that each paper is unique, which makes it impossible for anyone to copy the answer from someone else. Of course, it's time-consuming and boring to do it by hand. Fortu
-memory stack, heap, method area.Usually we define a variable of a basic data type, a reference to a data, and a function call that is called by the field to save the stack space inside the JVM. Objects created through the new keyword and the constructor are heap spaces, which are part of the method area.10.math.round (11.5) is how much, math.round (-11.5) is how muchThe first result is 12, and the second result is-11. Because the rounding mechanism i
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