Tag：Original code
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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 […]
