how to calculate decibels

Completely understand the IP address -- after computing the relevant IP address, you can calculate the IP address and subnet mask: 1. network address 2. broadcast address 3. Address range 4. Several hosts on this website. Example 1: in the following example, the IP address is 192 · 168 · 100 · 5. The subnet mask is 255 · 255 · 255 · 0. Calculate the network address, broadcast address, address range, and num

FormulaCaille (Zeller) formula, is a calculation of the week formula, casually to a date, you can use this formula to calculate the day of the week.To calculate the date on or before October 4, 1582, the formula is the example of September 3, 1582: After September 3, 1582: W = (d + 2*m+3* (m+1)/5+y+y/4-y/100+y/400)%7; September 3, 1582 before: W = (d+2*m+3* (m+1)/5+y+y/4+5)% 7;NoteIn the Year 1, February as

The maximum number of concurrent users of a system is 1100, how can the system to calculate the maximum number of users supported.The user performance requirements are as follows: Support 1 million registered usersPerformance Requirements Analysis:1, according to the requirements of users, the system to support 1 million users, wherein the performance of the machine configuration? What is the peak value? Bandwidth? such as2, if all use the company's t

The following describes how to use php to calculate the Mail size. For more information about how much space your inbox occupies, see, calculate the size of each email (title + content + nearby), and then sum; 1. calculate the nearby size; 2. calculate the title and content size 3.

Use php to calculate the arrangement and combination. The previous day, because the business needs to write a piece of code for calculating the arrangement and combination, I sorted it out today, and then copied the code as follows :? Php *** mathematical problem to be solved: Calculate C (a wrote a piece of code for computing arrangement and combination that was required by the business a few days ago. I s

Use php to calculate the difference function of two dates. use php to calculate the difference function. The difference function of php computing two days is shared. The difference function of php computing is very simple and practical. the code is as follows: * ** date-calculate two dates. php calculates the difference function of two dates. php calculates the d

PHP uses Strtotime to calculate the number of days between two given dates, strtotime days This example describes how PHP uses Strtotime to calculate the number of days between two given dates. Share to everyone for your reference. The specific analysis is as follows: PHP's Strtotime function is used to parse the datetime description of any English text into a Unix timestamp. This function uses the TZ e

The generated text content is variable. So how can I accurately calculate the width of an image generated based on the text? The generated text content is variable. So how can I accurately calculate the width of an image generated based on the text? Reply content: The generated text content is variable. So how can I accurately calculate the width of an image

2. Calculate the maximum common divisor and least common multiple of m and n (maximum common divisor: Rotary phase division ). PublicclassJiejue2 {publicstaticvoidmain (Stringargs []) {System. out. println (gongyue (8, 6); System. out. println (gongbei (8, 6);} calculate the maximum approximate number of m and n publicstaticintgon 2. Calculate the maximum common

As we all know, Excel is the master of data calculation and analysis, our daily life when we use Word, there is a need to calculate the data in the Word table, we think of using an Excel spreadsheet to process, and then fill the data into the corresponding cells, but we also understand that If you use an Excel spreadsheet to calculate this data one by one, once the data needs to be modified, we need to rewo

Basic C language algorithms-remove the highest score, remove the lowest score, and calculate the average value///*========================================================== ======================================Question: This method is usually used to calculate a contestant's score during the competition. Remove a highest score andLowest score, calculate the aver

overflow to become the maximum value . We can skillfully use this feature of overflow to seekThe maximum value of the various types of variables.Crossing, the text does not write code, the detailed code put in my resources, you can click here to download the use. In the code IThey calculate the maximum value of the INT type variable. You can expand yourself to calculate the maximum value of other types of

This article describes how to calculate the difference in days between two dates in javaScript (sample code ). 1. Calculate the number of days when the two dates are different. For example:Str1 = "2002-01-20"Str2 = "2002-10-11"How does one use javaScript to calculate the number of days between str1 and str2? The Code is as follows:

In python, The datetime module can be used to conveniently calculate the difference between two time points. The unit of datetime time difference can be days, hours, seconds, or even microseconds, let's take a closer look at the powerful functions of datetime. I wrote something today to calculate the time difference. I remember it was written last year. So I mark it again today to avoid forgetting it. In

If I already know the year and the week of the year (52 weeks in a year), calculate the initial date and end date of the week. The Code is as follows: 1 functionGetWeekDate ($ year, $ week) 2 {3 $ monthsarray (1Jan ., 2Feb ., 3Mar ., 4Apr ., 5May ., 6Jun ., 7Jul ., 8Aug. If I already know the year and the week of the year (52 weeks in a year), calculate the initial date and end date of the week. The Code is

How to calculate the code running performance and the code running performance During the development process, a function may have multiple implementation methods. To pursue code performance, we often need to compare the running time of each implementation method, so as to select the best performance implementation method. So how can we calculate the running time of a piece of code (or function)? This is wh

results, 0 1 4 9 5 exchanged 2 times, is equal to the number of 4 reverse orders. 4th bubble results, 0 1 4 5 9 exchanged once, is equal to the number of 5 reverse orders. 5th bubble results, 0 1 4 5 9 exchanged 0 times, it is equal to the number of 9 reverse orders. 2 + 1 + 2 + 1 + 0 = 6 So the problem is to find the reverse order of the array? Therefore, we only need to traverse each bit, calculate the number of reverse orders for each bit, and sum

Calculate accounts for group buying websites (Article: Hero Wang) I have always felt unreliable about the group buying model, although many VC and friends are optimistic about the group buying model.In the past few days, I have met several friends and talked about group buying. we have to worry about calculating an account for group buying. 1. For the largest group buying website, the number of employees is 4000, which is calculated based on the per c

"The beauty of programming -- Microsoft technology interview experiences" "Calculate the number of 1 in the binary number" By zellux By the Electronic Industry Press Bowen viewpoint and w3china.org community jointly held a "look at the chapter, write book reviews, win the" Beauty of programming-Microsoft technology interview experience "activities, see: http://bbs.w3china.org/dispbbs.asp? Boardid = 42 id = 61162 Everyone was enthusiastic about the

How many lines of source code will be mentioned in some books on Software Engineering. for example, projects with 1 million lines of code and 100,000 lines of code may adopt different management methods. so I want to know how many lines of code I have participated in. but when I asked my colleagues, I was not quite clear about it. It may look like hundreds of thousands or even millions of people. this is too inaccurate. so I thought of writing some code to c