《c陷阱與缺陷》筆記–移位元運算

#include <stdio.h>int main(void){        int a = 2;        a >> 32;        a >> -1;        a << 32;        a << -1;        return 0;}

上面代碼編譯時間出現如下錯誤：

yiwei.c: In function 'main':
yiwei.c:5:2: warning: right shift count >= width of type [enabled by default]
yiwei.c:6:2: warning: right shift count is negative [enabled by default]
yiwei.c:7:2: warning: left shift count >= width of type [enabled by default]
yiwei.c:8:2: warning: left shift count is negative [enabled by default]

因為移位有一條規則：

如果被移位的對象長度是n位，那麼移位技術必須大於或等於0，而且小於n。