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prefix operator comparison table

Subject	have example	have purpose
++	example expression equivalent longer expression a++; b=a++; ++a; b=++a; a=a+1; b=a; a=a+1; a=a+1; a=a+1; b=a;	to increment its operand by one
--	example expression equivalent longer expression a--; b=a--; --a; b=--a; a=a-1; b=a; a=a-1; a=a-1; a=a-1; b=a;	to decrement its operand by one

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