OR和||之间的功能差异 [英] Functional difference between OR and ||
问题描述
鉴于功能：
功能优先（）{
echo" first \ n";
返回true;
}
函数second（）{
echo" second\\\
" ;;
return true;
}
除了运算符优先级之外，是否有任何功能差异（
似乎不是任何）： br />
if（first（）|| second（））{
echo" done\\\
";
}
和
if（first（）OR second（））{
echo" done\\\
;;
}
返回：
首先
完成
Daniel Klein
Given the functions:
function first() {
echo "first\n";
return true;
}
function second() {
echo "second\n";
return true;
}
Besides operator precedence, is there any functional difference (there
doesn''t appear to be any) between:
if (first() || second()) {
echo "done\n";
}
and
if (first() OR second()) {
echo "done\n";
}
Both return:
first
done
Daniel Klein
推荐答案
Daniel Klein写道：
Daniel Klein wrote:
鉴于功能：
函数优先（）{
echo" first \ n" ;;
返回true;
}
函数second（）{
echo" second\\\
" ;;
返回true;
}
除了运算符优先级，是否有任何功能差异（
似乎不是任何）：
if（first（）||第二个（））{
echo" done\\\
";
}
和
if（first（）OR second（））{
echo" done\\\
" ;;
}
两次退货：
优先
完成
Daniel Klein
Given the functions:
function first() {
echo "first\n";
return true;
}
function second() {
echo "second\n";
return true;
}
Besides operator precedence, is there any functional difference (there
doesn''t appear to be any) between:
if (first() || second()) {
echo "done\n";
}
and
if (first() OR second()) {
echo "done\n";
}
Both return:
first
done
Daniel Klein
我甚至不知道你可以使用OR或AND。从手册：
I wasn''t even aware that you could use OR or AND. From the manual:
e = false ||真正; //
e = false || true; //
e将被分配给（false || true）这是真的
e will be assigned to (false || true) which is true
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