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The increment and decrement operators exist in prefix and postfix form.

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The increment and decrement operators exist in prefix and postfix form.

int a = 1;

int b = 1;

int tmp = 0;

tmp = ++a;        /* increments a by one, and returns new value; a == 2, tmp == 2  */

tmp = a++;        /* increments a by one, but returns old value; a == 3, tmp == 2 */

tmp = --b;        /* decrements b by one, and returns new value; b == 0, tmp == 0 */

tmp = b--;        /* decrements b by one, but returns old value; b == -1, tmp == 0 */

Note that arithmetic operations do not introduce sequence points, so certain expressions with ++ or -- operators may introduce undefined behaviour.

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