Question at position 1 Which of the following is a valid variable name?firstVarfirst-varfirst var1stVarAll of the above are valid

Question

Question at position 1 Which of the following is a valid variable name?firstVarfirst-varfirst var1stVarAll of the above are valid

BlackTom AI · Accepted Answer

Consider the question about valid variable names. 
Option 1: 'firstVar' — this follows typical variable naming rules: starts with a letter and uses only letters and digits. It is valid.
Option 2: 'first-var' — contains a hyphen. In most programming languages, the hyphen is interpreted as a minus sign, so it cannot be part of an identifier. This is invalid.
Option 3: 'first var' — includes a space, which is not permitted in variable names. Identifiers cannot contain spaces. This is invalid.
Option 4: '1stVar' — begins with a digit. Most languages require identifiers to start with a letter or underscore, so this is invalid.
Option 5: 'All of the above are valid' — since several of the listed options are invalid, this overarching statement cannot be true. This is invalid.
In summary, only the first option adheres to common rules for valid identifiers, while options 2–4 violate typical identifier constraints, and option 5 falsely claims all are valid.

Question at position 1 Which of the following is a valid variable name?firstVarfirst-varfirst var1stVarAll of the above are valid单项选择题

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