Discussion
What is the output of this C code?
int main()
{
int x = -2;
if (!0 == 1)
printf("yes\n");
else
printf("no\n");
}
Answer: A
Correct answer: yes
! is logical negation: it maps zero to 1 and any non-zero value to 0. So !0 is exactly 1, the comparison !0 == 1 holds, and the program prints yes. Contrast ~0, which flips bits and gives -1.
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