Category: default

The representation of cyclic decimal numbers and the length of loop nodes

Question: 　　Input integer a and B, output a/b’s cyclic decimal representation and its loop node length. For example, the decimal number of a=5 b=43 is 0. (116279069767441860465), and the loop node length is 21.   Analysis: 　　The calculation process of long division   　　　　①mod = a%b；   　　　　②Decimal = (mod*10) / B;   　　　　③mod = （mod*10）%b；   　　Cycle, step 3, when there is a repeating residue, that is, the loop section appears. Matters needing attention: 　　When the two or three steps above are looped, the remainder is zero, that is...

Git download and install

Download https://git-scm.com/download/win Reference https://www.cnblogs.com/wj-1314/p/7993819.html After installation, the desktop will appear.   Initialization  Check your username and email address: 　　$ git config user.name 　　$ git config user.email Modify your username and email address: 　　$ git config –global user.name “xxx” 　　$ git config –global user.email “xxx” Update to a historical version https://www.jianshu.com/p/0d4e62dcc62c Client https://www.cnblogs.com/shanheyongmu/p/6726452.html https://www.jianshu.com/p/466cf85c0ad8 ...

The meaning of every field in Linux top command

PID：ID of the processUSER：Process ownerPR：The priority level of the process is smaller and the priority is implemented.NI：nicevalueVIRT：Virtual memory occupied by processRES：Physical memory occupied by processSHR：Shared memory used by processesS：The state of the process. S means dormancy, R means running, Z indicates dead state, and N indicates that the process priority is negative.%CPU：Process occupancy rate of CPU%MEM：The percentage of physical memory and total memory used by processesTIME+：The total CPU time occupied after the process starts, that is, the cumulative v...

Native JS adds class name, deletes class name.

1、Add class name: document.getElementById("myDiv").classList.add("myStyle"); 2、Delete class name: document.getElelmentById("myDiv").classList.remove("myStyle") 3、Check whether there is any CSS fatigue: myDiv.classList.contains("myCssStyle") //return true or false 　　Note: when we add multiple class names, we write them side-by-side and separate them with commas.  

09-Mysql database — variants of foreign keys

This section focuses on: How to find out the relationship between two tables Three relations of tables   1. Introduction Because of the constraint of foreign key, the two tables form three relationships: Multi to one Multiple to many One-on-one Two, focus on understanding if you find out the relationship between the two tables.   Three, three relationships of tables （1）Books and publishers 　　One to many (or many to one): a publishing house can publish many books. Look at the picture and talk. 　　Association mode: foreign key     create table press( id int primary k...