Sign extension is a consequence of the way C evaluates expressions. There is a rule in C called promotion rule. C will implicitly cast all small types to int before doing the evaluation.
Let's see what happens to our expression:. If char is unsigned that value is interpreted as , if it is signed it is When doing the calculation, C will extend the value to an int size 16 or 32 bits generally. This means that if the variable is unsigned and we will keep the value , the bit-pattern of that value as int will be 0xFF. The sign was extended to the size of the tempory used to do the calculation.
And thus oring the temporary will yield the wrong result. On x86 assembly it is done with the movsx instruction movzx for the zero extend. If byte1 is of some other type say integer of 4 bytes, bitwise AND with 0xFF leaves you with least significant byte 8 bits of the byte1. If byte1 is a type that's signed or has more than 8 bits e. In that respect both will work equally poorly. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? The results were not unexpected, as Java 8 is still widely used. Very unfortunate, though, as tons of new features and improvements are added to newer Java versions.
But in terms of features, Java 8 was definitely a game-changer from a developer perspective. Seamus Quitzon. Java is not the hardest language to start with. So, it becomes way popular among novice developers joining the ranks of Java coders every single day. If you are reading this blog post, you might be interested in learning Java. Java is widely used across industry, and especially in the area of Enterprise software, which results in many high paying job opportunities and makes this programming language a common language for newbies.
A general promotion of it within colleges and other institutions providing a formal Computer Science education also contributes to its popularity. However, these are not the only advantages of Java — among other things, it allows you to adopt good practices and makes it way easier to learn other languages in the future. In this post, I am going to share some of them with you.
Beyond all doubt, practice is important and valuable. But, before we get to the advantages of hands-on experience, I want to draw your attention to one essential thing I often tell my students. New programmers who are just learning and start implementing things, without being supervised, often end up adapting bad practices.
To avoid that, especially when you are making your first steps in programming, I recommend looking for a person who will supervise you and teach you. A strong mentorship with someone engaged in a serious project, as well as communication within the community in the form of sharing code and asking for feedback, is worth the effort.
Similarly, when you are applying for your first job, you want to be looking for a company with a strong team and a good leader who would be keen on investing into your learning. Learning by doing is different from learning by passively consuming the information. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience. Necessary Necessary. Necessary cookies are absolutely essential for the website to function properly.
These cookies ensure basic functionalities and security features of the website, anonymously. The cookie is used to store the user consent for the cookies in the category "Analytics". The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is used to store the user consent for the cookies in the category "Other. The cookie is used to store the user consent for the cookies in the category "Performance".
It does not store any personal data. Functional Functional. These are Bitwise Operators reference. Hope that helps Only authorized users can answer the question. Please sign in first, or register a free account.
Not the answer you're looking for? Browse other questions tagged : c.
0コメント