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Questions and Answers
What are the general rules for naming variables in C++?
Variables in C++ can contain letters, digits, and underscores. They must begin with a letter or an underscore, are case sensitive, and cannot contain whitespaces or special characters like ., #, %, etc. Additionally, reserved words (C++ keywords) cannot be used as variable names.
Why is it important to use descriptive names for variables in C++?
Using descriptive names for variables makes the code more understandable and maintainable. It allows other programmers (or even the original programmer after a period of time) to easily understand the purpose and usage of the variables.
What is the purpose of using the const keyword in C++?
The const keyword is used to declare a variable as 'constant', meaning its value cannot be changed once it has been assigned. This makes the variable read-only.
What is the difference between using 'int minutesPerHour = 60;' and 'int m = 60;' in terms of variable naming?
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Can you use reserved words, such as C++ keywords, as variable names in C++?
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When was the ARPANET developed and what was its purpose?
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What was the NSFNet and how did it contribute to the development of the Internet?
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What significant events occurred in the 1990s in relation to the Internet's development?
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What was the major service developed in 1993 and who was the person behind its development?
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What are some statistics about the U.S. Internet growth mentioned in the text?
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Study Notes
C++ Variable Naming
- In C++, variable names should be descriptive and follow a specific format to ensure readability and maintainability of the code.
- Using descriptive variable names is important because it helps other developers understand the purpose and functionality of the code.
- The
constkeyword in C++ is used to declare constants, which are values that cannot be changed once they are initialized. -
int minutesPerHour = 60;is a better variable declaration thanint m = 60;because it clearly indicates the purpose of the variable. - Reserved words, such as C++ keywords, cannot be used as variable names in C++.
Development of the Internet
- The ARPANET was developed in the 1960s as a project of the United States Department of Defense, with the purpose of creating a robust and fault-tolerant network.
- The NSFNet was a network developed in the 1980s that contributed to the development of the Internet by providing a high-speed network backbone for the United States.
- In the 1990s, several significant events occurred in the development of the Internet, including the widespread adoption of the World Wide Web and the development of Internet Service Providers (ISPs).
- In 1993, the Mosaic web browser was developed by Marc Andreessen, which popularized the World Wide Web and made it more accessible to the general public.
- According to statistics, the U.S. Internet user base grew from 14 million in 1993 to 68 million in 1997, with the number of Internet hosts increasing from 1.3 million to 10 million during the same period.
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Description
Test your knowledge of C++ variable naming conventions, identifiers, and constants with this quiz. Learn about the importance of choosing unique and descriptive names for variables, as well as the general rules for naming them in C++.
