Programmer Think

1, String substitution str_replace("iwind", "kiki", "i love iwind, iwind said"); //Will output "i love kiki, kiki said" str_replace(find,replace,string,count) parameter description Find required. Specifies the value to find.   Replace required. Specifies the value to replace the value in find.   String required. Specifies t ...

configuration file There are two configuration file formats for SpringBoot. You can choose one of them. yaml is officially recommended: Format of application.properties key=value application.yaml key: value format Profile location SpringBoot loads the main configuration file from all four locations; complementary configuration. Priority is fr ...

Branch programming (1) Simple branch program: two branches are obtained by judging a condition, and the judgment result of the condition determines the execution direction of the program. The disadvantage lies in the limitation of execution flow direction, for example, when the condition is a multi se ...

Catalog (1) Project introduction (two) code and debugging (3) Summary (1) Project introduction DS18B20 is a commonly used digital temperature sensor. Its output is a digital signal, which has the characteristics of small size, low hardware cost, strong anti-interference ability and high precision. T ...

The data generated by C + + when the program is running belongs to temporary data, which will be released after the program is running. Sometimes we need to store some simple data permanently. At this time, we can use files to persist the data. There are two types of files: 1. Text file: the file i ...

Article directory First, query 1. Basic query (1) Basic usage (2) Filter data WHERE (3) Sort ORDER BY (4) Character matching query LIKE (5) Query result does not repeat DISTINCT (6) GROUP BY (7) LIMIT query results LIMIT 2. Querying with collection functions (1) COUNT() the total number of rows i ...

this is a note l0 = 'acoilia.kinlrmi.3000.clevorihno' l1 = l0.split('.') #List is variable type print(l1) #li it's a list now def return_function(): #these functions return values a = l1[0] #list1 = [index of the element] #b = len(l1) #shows how m ...

HDOJ10 day question sequence Four or five roads a day (1.1 represents the first road on the first day), from easy to difficult Let's share my results. They are all AC. please give me your opinion~ Article directory 1.1.HDOJ 1000 1.2.HDOJ 1089 1.3.HDOJ1096 1.4.HDOJ1001 1.5.HDOJ 2000 2.1 HDOJ 2001 2.2 ...

Python Learning Notes Day 1 Writing of hello world Hello world in other languages C++ C JAVA php ruby go variable Naming variables ASCII Code Binary character User Interaction Mode Notes User typing (keyboard entry) Formatted output and connector: Form One Form Two Form Three if elif else w ...

BM matching algorithm follows one condition and two rules: 1. Conditions: The pattern string matches the main string from the end of the string, that is, from the back to the front Two, rules: 1. Bad character rule: in the process of pattern string and main string matching in turn, if there are unmatched characters in the main string, this ...