Writing a program without IF or :? conditional operator

You can use a boolean expression that is convertible to 0 or 1, and which has no effect when the value is 0.

multiplies the second number by 2 if the first one was bigger

second = second + (first > second) * second;

and divides the first one by 2 if the second one was bigger.

first = first - (second > first) * (first / 2);

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