floor | 易学教程

Why does Math.Floor(Double) return a value of type Double?

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问题 I need to get the left hand side integer value from a decimal or double. For Ex: I need to get the value 4 from 4.6. I tried using Math.Floor function but it's returning a double value, for ex: It's returning 4.0 from 4.6. The MSDN documentation says that it returns an integer value. Am I missing something here? Or is there a different way to achieve what I'm looking for? 回答1: The range of double is much wider than the range of int or long . Consider this code: double d =

Rounding to nearest fraction (half, quarter, etc.)

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So, I need to create the following functions but my head can't think of any possibility in PHP without complicated math. Round always up to the nearest decimal (1.81 = 1.90, 1.89 = 1.90, 1.85 = 1.90) Round always down to the nearest decimal (1.81 = 1.80, 1.89 = 1.80, 1.85 = 1.80) Round always up to the nearest x.25 / x.50 / x.75 / x.00 (1.81 = 2, 1.32 = 1.50) Round always down to the nearest x.25 / x.50 / x.75 / x.00 (1.81 = 1.75, 1.32 = 1.25) Round always up to the nearest x.50 / 1 (1.23 = 1.50, 1.83 = 2) Round always down to the nearest x.50 / 1 (1.23 = 1, 1.83 = 1.50) I have searched on

countDown

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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <title>countDown</title> <meta name="description" content=""> <meta name="keywords" content=""> <link href="" rel="stylesheet"> </head> <body> 天 小时 分钟 秒 毫秒 </body> <script type="text/javascript"> var spans = document.getElementsByTagName('span'); var endDate = new Date('2015/06/01,00:00:00'); var timer = setInterval(function(){ var nowDate = new

C integer division and floor

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问题 In C, is there a difference between integer division a/b and floor(a/b) where both a and b are integers? More specifically what happens during both processes? 回答1: a/b does integer division. If either a or b is negative, the result depends on the compiler (rounding can go toward zero or toward negative infinity in pre-C99; in C99+, the rounding goes toward 0). The result has type int . floor(a/b) does the same division, converts the result to double, discards the (nonexistent) fractional part

floor函数

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floor函数，其功能是“向下取整”，或者说“向下舍入”、“向零取舍”，即取不大于x的最大整数，与“四舍五入”不同，下取整是直接取按照数轴上最接近要求值的左边值，即不大于要求值的最大的那个整数值。在C语言的函数库中，floor函数的语法如下： #include<bits/stdc++.h> using namespace std; int main() { double a; scanf("%lf",&a); a=floor(a); printf(“%lf",a); } 来源： https://www.cnblogs.com/Youio-bolg/p/11333906.html

How to ceil, floor and round bcmath numbers?

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问题 I need to mimic the exact functionality of the ceil(), floor() and round() functions on bcmath numbers , I've already found a very similar question but unfortunately the answer provided isn't good enough for me since it lacks support for negative numbers and the precision argument for the round() function is missing . I was wondering if anyone can come up with a rather short and elegant solution to this problem. All input is appreciated, thanks! 回答1: After a night lost trying to solve this

How does x|0 floor the number in JavaScript?

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问题 In the accepted answer on my earlier question ( What is the fastest way to generate a random integer in javascript? ), I was wondering how a number loses its decimals via the symbol | . For example: var x = 5.12042; x = x|0; How does that floor the number to 5 ? Some more examples: console.log( 104.249834 | 0 ); //104 console.log( 9.999999 | 0 ); // 9 回答1: Because, according to the ECMAScript specifications, bitwise operators operators call ToInt32 on each expression to be evaluated. See 11