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term ++is called a post-increment.
The term must be an lvalue (see Expression Statements) and must have an arithmetic type. The type and value of the whole term is that of the incremented term. After the value is taken, 1 of the appropriate type is added to the lvalue. The result is undefined if the same object is changed more than once in the same expression.
term --behaves analogously to the increment case, except that 1 is subtracted from the lvalue.