Tag：Original code
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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 […]
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Time：2020-2-10
About kaggle Kaggle is a data competition platform, founded in 2010 and acquired by Google in 2017. The platform provides a large number of open datasets and free computing resources. Only need to register an account can write code and analyze data online. Big query bitcoin dataset Data set homepage https://www.kaggle.com/bigque There are currently more […]
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Time：2019-10-17
Sample code #include int main() { char c = 255; printf(“%d\n”, c); int i = 255; printf(“%d\n”, i); return 0; } Output result -1 255 explain Computers store values in the form of binary complements. The size of char is 1 byte (8bit), and the value range is – 128 ~ 127. The […]
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Time：2019-7-16
Recently, there have been so many thieves who haven’t had much time to write blogs and haven’t updated blogs for a long time. But when I look at the JDK source code, I have a great feeling that the foundation is really important, so what is the foundation? In addition to the basic grammar of […]
