In C++, subprograms are referred to as ______ .
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The set of rules that determines the meaning of instructions written in a programming language is called ______ .
The null statement is an empty statement consisting only of a semicolon.()
The null string (empty string with no characters) must be denoted by the special NULL symbol.()
A literal string can continue onto more than one line, as long as it is enclosed in double quotes.()