Tag：Letter
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Time：2021-6-21
[exercise 11] calculate the byte sizes of int, float, double and char Title:Calculates the byte sizes of int, float, double and char 1. AnalysisThe sizeof operator is used to calculate the byte sizes of int, float, double and char variables.Sizeof is a monocular operator, which gives the storage size of its operands in byte form. […]
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Time：2021-6-14
Determine whether there are letters select PATINDEX(‘%[A-Za-z]%’, ‘ads23432′)=0 (if there are letters, the result is > 1) Determine whether there are numbers PATINDEX(‘%[0-9]%’, ‘234sdf’)=0 (if there is a number, the result is > 1)
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Time：2021-6-6
In git, you can use the GIT config command to set the alias of the specified command. When the command is executed later, you can use the alias instead to reduce the input. For example, the following command sets the letterslbylogAlias for command: $ git config –global alias.l log After setting, executegit lEquivalent to executiongit […]
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Time：2021-5-31
Title: Given a string, find the length of the longest substring without repeating characters. Example 1: Input: “abcabcbb” Output: 3 Explanation: The answer is “abc”, with the length of 3. Example 2: Input: “bbbbb” Output: 1 Explanation: The answer is “b”, with the length of 1. Example 3: Input: “pwwkew” Output: 3 Explanation: The answer […]
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Time：2021-5-29
Argspark is the standard module of Python command line parsing Download address:https://pypi.org/project/argp… code import argparse Parser = argparse. Argumentparser (description =’a number passed in the command line ‘) parser.add_ Argument (“square”, help = “please enter a number”, type = int) parser.add_ argument(“input_ STR “, help =” please enter a letter “, type = STR) args […]
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Time：2021-5-11
Topic content Roman numerals contain the following seven characters: I， V， X， L，C，D and M。 character numerical value I 1 V 5 X 10 L 50 C 100 D 500 M 1000 For example, the Roman numeral 2 is written as II ， That is, two parallel ones. […]
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Time：2021-4-30
Substitution is a method of replacing a letter in plaintext with other letters, numbers or symbols. Substitution cipher is to set up a substitution table first. When encrypting, the plaintext that needs to be encrypted is replaced by corresponding characters by looking up the table. After plaintext characters are replaced one by one, a meaningless […]
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Time：2021-4-23
1. Why write Regular expressions can be used in any development language, even in writing a Linux command. They are used to specify the rule mode of retrieval and replacement. Although it is very versatile, but there is a big disadvantage, that isIt’s very unfriendly to the old players. If you want to use regular […]
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Time：2021-4-19
How to exit QEMU ctrl + aRelease and pressx ⚠ The letters here are lowercase! (don’t press the capital key)
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Time：2021-4-18
1. When used to customize components, the prop and default event name of V-model are changed, and the model option is removed //Parent component Bound value: {message}} //Subcomponents export default { //2. X usage, you can modify the prop and trigger the event name, model to discard // model: { //Prop: ‘value’, // the default […]
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Time：2021-4-15
Detailed use of Chinese word segmentation based on Jieba package in python (1) 01. Preface Previous articles also used some Jieba participles, but they are basically in the skin. Now we will analyze them in the existing Python environmentOfficial documentsDo some understanding and specific introduction. The main content of this paper is also obtained from […]
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Time：2021-4-15
The original text is published in: https://www.chenxublog.com/2020/03/08/c-fast-convert-hex-char-array.html Blog park is only for archiving, if there is room for optimization, it will not be corrected later reason The reason is that last night someone in the group was discussing how to convert a string into a stringHEXThe method is the best. In the end, which method […]
