Which of the following is(are) invalid string constant(s)? A. “7.15 pm” B. “i like e” C. “7.3el2” D. “1234el2” E. None of the above

The correct answer is: C. “7.3el2”

A string constant is a sequence of characters enclosed in double quotes. The following are valid string constants:

• “7.15 pm”
• “i like e”
• “1234el2”

However, the string constant “7.3el2” is invalid because it contains the character “l” which is not a valid character in a string constant.

The following are the valid characters in a

• Letters (a-z, A-Z)
• Numbers (0-9)
• The underscore (_)
• The dollar sign ($)
• The at sign (@)
• The percent sign (%)
• The ampersand (&)
• The apostrophe (‘)
• The quotation mark (“)
• The less-than sign (<)
• The greater-than sign (>)
• The question
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• The colon (:)
• The semicolon (;)
• The comma (,)
• The period (.)
• The forward slash (/)
• The vertical bar (|)
• The spacebar
• The tab character
• The newline character