Unary plus and minus operators ('+' and '-')
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In these unary + - expressions 

+ expr
- expr
the expr operand must be of arithmetic type. The result is the value of the operand after any required integral promotions for the unary plus ('+') operator, or negative of the value of the operand after any required integral promotions for the unary minus ('-') operator. Floating point negation is internally executed using the fneg function.

Note that both '+' and '-' operators also have a binary form.