How unary operator works?

Question

About unary incremental operators

Answer 1

https://www.tutorialspoint.com/cplusplus/unary_operators_overloading.htm

Answer 2

a=3;
b=5;

c=++a+b=4+5=9; a=4, b=5
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a=3;
b=5;

c=a++ +b++=3+5=8; a=4, b=6