Problem Statement: Which of the following operators are both unary and binary?

The minus operator - functions as both unary (negation: -x) and binary (subtraction: x - y). The plus operator + is primarily binary for addition, though it can act as a unary operator in some contexts. The asterisk * is primarily used for multiplication (binary) and pointer dereferencing (unary), but in C/C++ it's not traditionally classified as a true binary operator in the same sense. The keyword typedef is not an operator at all.

Step-by-step Derivation:
Analyze each option:

• A) typedef: A keyword, not an operator. Rejected.
• B) +: Primarily binary (addition: 3 + 5 = 8). Can act as unary (positive sign: +5), but this is less common.
• C) -: Clearly unary (negation: -5, -(x+y)). Clearly binary (subtraction: 10 - 3 = 7). This is the best answer.
• D) *: Binary for multiplication (3 * 4 = 12), unary for pointer dereferencing (*ptr), but not traditionally called an operator in both contexts in standard operator theory.

The minus sign - is the canonical example of an operator that is both unary and binary in C/C++.