C不是运算符应用于int?
我有
int x = 5;
printf("%d", x); //i get 5... expected
x = !x;
printf("%d", x);// i get 0... hmm
5 二进制是:0101如果我们对每个位进行逆运算,我们应该得到 1010,但 !
不一定是反相器,它是一个逻辑运算符.为什么我得到一个 0
?
5 in binary is: 0101
if we apply the inverse to each bit, we should get 1010, but !
is not necessarily an inverter, it's a logical operator. Why do i get a 0
?
是因为在 C 中,正数被视为真,所以 !
-ing 它会导致 0?这个编译器是特定的吗?
is the reason that, in C, a positive number is treated as true and so !
-ing it would result in 0?
is this compiler specific?
推荐答案
not (!
) 运算符返回 0
或 1
,分别取决于输入是非零还是 0
.
The not (!
) operator returns either 0
or 1
, depending on whether the input is non-zero or 0
respectively.
如果您正在寻找按位否定,请尝试 ~x
.
If you are looking for a bitwise negation, try ~x
.
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