Tag：Original code
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Time：2021-9-15
Basic concepts of binary Binary is the carry system of every 2 carry, and 0 and 1 are the basic operators. Modern electronic computer technology uses binary, because it only uses two digital symbols: 0 and 1, which is very simple and convenient and easy to be realized electronically. The information processed inside the computer […]
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Time：2021-7-29
Today, I’ll take you to review a forgotten C language knowledge point, the storage of negative numbers and a typical investigation form. Let’s look at a topic first #include int main() { int a,b,c,d; // perhaps int a,b,c,d; a=0x8; b=a>>1; c=~(~0<<1); d=b&c; printf(“c is %d\n”,c); printf(“d is %d\n”,d); } Resolution: Suppose the computer is storing eight […]
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Time：2021-7-22
Architecture and operating system Part 1. Architecture foundation 1. Von Neumann architecture All data and instructions processed by computer are represented by binary numbers Sequential execution program In the process of computer operation, the program to be executed and the data to be processed are first stored in the main memory (memory). When the computer […]
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Time：2021-7-3
Learning Apollo client in 21 minutes is a series, simple violence, package learning and package meeting. Build Apollo client and integrate ReduxUsing Apollo client to get dataModify local Apollo store dataProvide customized solutions Request interception Encapsulation and modification of client APIApollo store storage details Failure analysis and solution of writing to store Adding Apollo to […]
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Time：2021-6-17
In the process of automatic login using selenium, after the cookie has been obtained, an error is still reported: selenium. Common. Exceptions. Invalidcookie domain exception: Message: invalid cookie domain The original code for obtaining and adding a cookie is as follows: #Get cookie dr = webdriver.Chrome(“D:\softwarePro\BrowserDriver\chromedriver.exe”) dr.maximize_window() dr.get(url) c = dr.get_cookie(‘JSESSIONID’) print(c) #Add cookie dr […]
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Time：2021-5-12
1、 Concept explanation Number of machines: The binary representation of a number in a computer is called the machine number of the number. Machine number is signed, in the computer with a number of the highest place to store symbols, 0 represents a positive number, 1 represents a negative number. For example, + 2 binary […]
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Time：2021-3-2
About kaggle Kaggle is a data contest platform, which was founded in 2010 and acquired by Google in 2017. The platform provides a large number of open data sets and free computing resources. You only need to register an account to write code and analyze data online. Big query bitcoin dataset Dataset home page https://www.kaggle.com/bigque… […]
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Time：2021-2-12
A series of articles： Why is int8 in the range of [- 128127] Do you really understand sync.Once Is that right Today’s article is very basic. I saw it the other daygoA topic is actually different fromgoIt doesn’t matter much in itself. func main() { What is the value of B? If 128 is said […]
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Time：2020-10-31
introduce First, let’s look at a program and print it separately4and-4The reverse operation result of, code: public static void main(String[] args) { System.out.println(~4); System.out.println(~(-4));} Think about the results. If the results are – 4 and 4, please continue to look 187MFUkJ Yes, the results are – 5 and 3 (not as simple as the opposite number). Here we tell a universal formula […]
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Time：2020-10-12
Serious: exception sending context initialized event to listener instance of class org.springframework.web . context.ContextLoaderListenerorg.springframework.beans . factory.xml.XmlBeanDefinitionStoreException : Line 6 in XML document from class path resource [ applicationContext.xml ] is invalid; nested exception is org.xml.sax . saxparseexception; linenumber: 6; columnnumber: 33; the attribute ‘{1}’ associated with element type ‘class’ should have an open quotation mark. […]
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Time：2020-6-28
Original code, inverse code, complement code Signed displacement operation (< and > >Signed displacement operations are divided into < (shift left) and > > (shift right). These two kinds of displacements are for complement operation. Symbol bits are involved in displacement operation. Except for the negative number to fill 1 in the high position, the […]
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Time：2020-6-22
The last article talked about “how negative numbers are stored in computers”. After reading, we should have a basic understanding of the original code, the inverse code and the complement code. Today, let’s talk about why we use complement to express negative numbers in computers? First of all, we should be clear that the original […]
