C based
switch(ch){
case '\n':
lines += 1;
/*fail thru*/
case ' ':
case '\t':
words += 1;
default:
chars += 1;
}
<-左移位: 左边所移位的值丢弃,右边多出来的位用0补齐;
->右移位: 从左边移入新位分如下两种情况
1. logical shifting特点: 左边移入的为用0填充;
2. arithmetic shifting特点: 左边移入的位由原先该值的symbol bit决定,符号位为1 则移入的位均为1,为0移入的位为0;
关于位移运算总结:
右位移时,把最右边的几位--根据需要唯一的 位数 删除,再从左边填入,要是逻辑移位 最左边的补位都是0,要是算术右移位则最左边的 补入位根据原先值的符号位1,则全1,0则全0;
su - oracle -c "rlwrap sqlplus / as sysdba"
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