Question

1.6.1: Identifier validator. Check if the following identifiers are valid: c, cat, n1m1, short1, _hello, 42c, hi there, and cat! (Note: Doesn't consider library items.)

Answer 1

Answer:

correct option c, cat, n1m1, short1,

Explanation:

correct option c, cat, n1m1, short1,

The variable is used to store the value of the value varies during the program execution...

some of the basic rules of identifier

• The variable must be started with the alphabet  
• We cannot declare the variable name as keyword i.e "that value is already defined and in the compiler"
• Variable-length does not exceed 8 characters  
• We cannot use space to declared any variable
• _hello,42C, hi there and cat! are not follow the basic rule of identifier so they are not identifier validator