lvalue required as increment operand error

Question

#include 

int main()
{
   int i = 10;
   printf(\"%d\\n\", ++(-i)); // <-- Error Here
}

What is wrong with ++(-i)?

Answer 1

The ++ operator increments a variable. (Or, to be more precise, an lvalue—something that can appear on the left side of an assignment expression)

(-i) isn't a variable, so it doesn't make sense to increment it.