Discussion
What is the output of this C code?
int main()
{
int x = -2;
x = x >> 1;
printf("%d\n", x);
}
Answer: B
Correct answer: -1
-2 is all ones followed by a zero: \(\ldots 1110\). Shifting right on a signed negative value is an arithmetic shift in every mainstream implementation, so the sign bit is copied in from the left and the result is \(\ldots 1111 = -1\). Arithmetically it is a division by two, rounding toward negative infinity.
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