Tag：Floating point number
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Time：2021-10-24
preface 1. When PHP floating-point numbers are calculated, slight carelessness will lead to deviation, especially in financial industry, E-Commerce orders and mall projects. 2. The precision of floating point number is limited. Although depending on the system, PHP usually uses IEEE 754 double precision format, the maximum relative error due to rounding is 1.11e-16. Non […]
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Time：2021-10-20
Original link: https://blog.csdn.net/zhgl7688 This article mainly introduces the difference and division between% C and% s in C language. I hope it will be helpful to you. Let’s follow Xiaobian and have a look! %The C format corresponds to a single character, and the% s format corresponds to a string. Example: char a; char b[20]; […]
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Time：2021-10-15
Question: when the type in the max function is not numeric, for example, if the field type is varcher, is max (9) greater than max (10)? Example: query the maximum age of two people, one age = 9 and the other age = 10. sql： select max(age) from t_user; Query results: Replacement function: cast (age […]
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Time：2021-10-13
Hello, I’m Carson. Many friends and I make complaints about it in the past two years.ReactSource code, such as: Why does the scheduler use the data structure of small top heap instead of array? In the source code, all kinds of one-way linked lists and ring linked lists can’t you use arrays directly? Various bit […]
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Time：2021-10-8
Concept of Tensor Tensor in tensorflow is tensor, which is a mathematical object and a generalization of scalar, vector and matrix. We can directly understand that tensors are lists and multidimensional arrays. The dimension of the tensor is expressed in order: 0-order tensor scalar single value example: a = 1Dimension group of tensor vector […]
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Time：2021-10-4
With the rapid development of API, how to write more standardized API documentation is particularly important. Do you still generate and write these documents by hand? Then you are out! Sharp tools make good work. This article shares a tool:PHP_DOC。 The parameters, returns and descriptions of API interfaces can be viewed online and in real […]
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Time：2021-10-4
Golang’s interface {} is powerful and can point to various types of data. There are several methods for data type conversion There are the following definitions type BaseService struct { IService serviceName string routineNum int } type MyEnum int const ( CAT MyEnum = iota DOG ) var unknowValue interface{} unknowValue = baseService Method 1: […]
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Time：2021-9-25
1. Delete 0 byte file find -type f -size 0 -exec rm -rf {} \; 2. View process Sort by memory size PS -e -o “%C : %p : %z : %a”|sort -k5 -nr 3. Sorted by CPU utilization from large to small ps -e -o “%C : %p : %z : %a”|sort -nr 4. […]
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Time：2021-9-21
1. Preface JavaScriptDifferent from other programming languages (e.gJava、CWhen defining variables, there is no need to specify specific data types (such as numeric value, string, etc.)varVariables of all data types can be defined, because the specific data type of the variable will be automatically determined during the operation of the program. thatJavaScriptWhat data types are defined […]
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Time：2021-9-19
Mongo writes in quotation marks, resulting in some numeric fields of string type. Modify the field type to numeric type. db.Report99.find().forEach( function(doc){ db.Report99.update({‘_id’: doc._id},{$set:{“begin-quantity”: parseFloat(doc[“begin-quantity”])}}); // Change to floating point number db.Report99.update({‘_id’: doc._id},{$set:{“end-quantity”: NumberInt(doc[“end-quantity”])}}); // Change to integer } ); Mongo4.2 + version, the parameters can be as follows: db.getCollection(“my-report”).update( { “begin-quantity”: { $type: “string” […]
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Time：2021-8-24
For a long time, I haven’t wanted to write anything. Suddenly, I found that I still wanted to write something, even if I recorded my learning process. On the one hand, while learning, I take notes and experience to urge myself. On the other hand, I want to record it and share it with you. […]
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Time：2021-8-24
By Joe seifiTranslator: front end XiaozhiAuthor: Dmitri pavlutin Dream, dry goods, wechat search[move to the world]Pay attention to this dish washing wisdom who is still washing dishes in the early morning. This article GitHubhttps://github.com/qq449245884/xiaozhiIt has been included. There are complete test sites, materials and my series of articles for the interview of front-line large factories. […]
