Where is Wchar_t defined?

Related questions

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2. What is a Wchar_t in C++?
3. What happens when a null pointer is converted into bool?
4. What is difference between utf8 and utf16?
5. Is bool a fundamental data type in C++?
6. Why is UTF 16?
7. Which type is best suited to represent the logical values?
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Tags

1. #system
2. #enough
3. #where
4. #point
5. #while
6. #defined
7. #character
8. #single
9. #strings
10. #integer
11. #large
12. #original
13. #library
14. #value
15. #design
16. #standard
17. #wchar