In the prefix form, the increment or decrement takes place before the value is used in expression evaluation, so the value of the expression is different from the value of the operand. In the postfix form, the increment or decrement takes place after the value is used in expression evaluation, so the value of the expression is the same as the value of the operand.

++a; a değişkenini kullanmadan önce arttırma anlamına geliyor
a++; ise a değişkenini varolan değeriyle kullanıp sonra arttırmaya yarıyor.