Which statement correctly creates a new variable by combining the two string variables: firstName and lastName?

Question

BlackTom AI · Accepted Answer

We are asked: Which statement correctly creates a new variable by combining the two string variables: firstName and lastName?

Option 1: name = firstName & lastName
- Explanation: The & operator is not a universal string concatenation operator. In many programming languages, it represents a different operation (such as a bitwise AND) or is not valid at all. Therefore this would typically produce an error or unexpected result, not a proper string combination.

Option 2: name = "firstName" + "lastName"
- Explanation: This uses string literals rather than the variables. It would create the string "firstNamelastName" (or with a space if the language inserts one, but as written it joins the two exact words). This does not combine the values stored in firstName and lastName, so it does not meet the requirement of using the two variables.

Option 3: name = firstName + lastName
- Explanation: This is the standard approach in many languages (like JavaScript, Python, Java) to concatenate two string variables. It takes the contents of firstName and lastName and joins them into a single string assigned to name. This aligns with the goal of creating a new variable by combining the two existing variables.

Option 4: name = first name + last name
- Explanation: This syntax is invalid in most languages because variable names cannot contain spaces. The expression would be parsed as two separate identifiers with a plus in between, which is not a valid single expression for concatenation and would typically cause a syntax error.

Across these options, the key idea is using the actual string variables and a valid concatenation operator. The only choice that accomplishes that cleanly is the one that directly concatenates firstName and lastName using +, yielding the combined string stored in name.

Which statement correctly creates a new variable by combining the two string variables: firstName and lastName?单项选择题

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