identifiers-soln - Variable Names and Keywords Valid...

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Variable Names and Keywords Valid identifiers in C++: start with a letter or underscore all remaining characters are letters, digits, or underscores are not keywords Some Keywords The following are some of the C++ keywords. break case char class do double else float for if int long operator return sizeof struct switch typedef void while Problems Tell whether each of the following is a valid identifier in C++ and explain why not if it is not. 1.abc - Valid 2.123 - Not Valid; cannot start with digit 3.ABC - Valid 4.#include - Not Valid; must start with letter or underscore, not # 5.my Age - Not Valid; may not include space (see second bullet) 6.#define - Not Valid; cannot start with # 7.ABC! - Not Valid; ! not letter, underscore, or digit
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