推荐款式 [英] Recommended style
问题描述
大家好，
以下是生产代码中推荐的样式 -
....
fp = fopen（" xyz.txt"，" r"）;
if（fp == NULL）{
.... < br $>
}
或
fp = fopen（" xyz.txt"，" r"）;
if（！fp）{
....
}
谢谢。
Hi all,
Which is the recommended style in production code for the following -
....
fp = fopen("xyz.txt", "r");
if (fp == NULL) {
....
}
OR
fp = fopen("xyz.txt", "r");
if (!fp) {
....
}
Thanks.
推荐答案
怎么样
if（（fp = fopen（filename，" mode"））= = NULL）
{
//失败
}
" Kelvin Moss" <公里********** @ yahoo.com>在消息中写道
news：11 ********************** @ c13g2000cwb.googlegr oups.com ...
how about
if((fp=fopen(filename,"mode"))==NULL)
{
//failed
}
"Kelvin Moss" <km**********@yahoo.com> wrote in message
news:11**********************@c13g2000cwb.googlegr oups.com...
大家好，
以下是生产代码中推荐的样式 -
...
fp = fopen（" xyz。 txt"，" r"）;
if（fp == NULL）{
...
}
fp = fopen（ " xyz.txt"，" r"）;
if（！fp）{
...
}
谢谢。
Hi all,
Which is the recommended style in production code for the following -
...
fp = fopen("xyz.txt", "r");
if (fp == NULL) {
...
}
OR
fp = fopen("xyz.txt", "r");
if (!fp) {
...
}
Thanks.
Kelvin Moss写道：
Kelvin Moss wrote:
大家好，
以下是生产代码中推荐的样式 -
...
fp = fopen（" xyz.txt"，" r"）;
if（fp == NULL）{
...
}
fp = fopen（" xyz.txt"，" r"）;
if（！fp）{
。 ..
}
谢谢。
Hi all,
Which is the recommended style in production code for the following -
...
fp = fopen("xyz.txt", "r");
if (fp == NULL) {
...
}
OR
fp = fopen("xyz.txt", "r");
if (!fp) {
...
}
Thanks.
我认为在这样的情况下，任何一个都可以。它只是
前者更明确的情况，而后者使用了一个着名的C b成语
。
您可能希望在项目中保持一致 - 但要么选择
就足够透明了。 （我更喜欢第二种，但那是纯粹的意见。）
HTH，
- g
-
Artie Gold - 德克萨斯州奥斯汀
http://it-matters.blogspot.com （新帖子12/5）
http://www.cafepress.com/goldsays
I think in a case like this, either one would be just fine; it''s just
the case that the former is more explicit, while the latter employs a
well-known C idiom.
You might want to keep it consistent in a project -- but either choice
is sufficiently transparent. (I prefer the second, but that''s pure opinion.)
HTH,
--ag
--
Artie Gold -- Austin, Texas
http://it-matters.blogspot.com (new post 12/5)
http://www.cafepress.com/goldsays
Alex写道：
怎么样？ />
if（（fp = fopen（filename，" mode"））== NULL）
{
//失败
}
how about
if((fp=fopen(filename,"mode"))==NULL)
{
//failed
}
或相反：
if（NULL ==（fp = fopen（filename，mode）））{
/ *失败* /
}
左边的常量使C编译器婊子大约=
而不是==是一个常见的程序员错误，通常
在运行时调试期间需要很长时间才能找到;}
与下面相同：
fp = fopen（文件名，模式）;
if（NULL == fp）{
/ * failed * /
}
if（！fp）左边不需要常量，因为！是一个
一元逻辑运算符。
- 龙
or, conversely:
if ( NULL == ( fp = fopen( filename, mode ) ) ) {
/* Failed */
}
Constants going on the left makes the C compiler bitch about =
instead of == which is a common programmer error that generally
takes a long time to find during runtime debugging ;}
Same with below:
fp = fopen( filename, mode );
if ( NULL == fp ) {
/* failed */
}
if ( !fp ) doesn''t require constants on the left, since ! is a
unary logic operator.
-- The Dragon
大家好，
以下是生产代码中推荐的样式 -
...
fp = fopen（" xyz。 txt"，" r"）;
if（fp == NULL）{
...
}
fp = fopen（ " xyz.txt"，" r"）;
if（！fp）{
...
}
谢谢。
Hi all,
Which is the recommended style in production code for the following -
...
fp = fopen("xyz.txt", "r");
if (fp == NULL) {
...
}
OR
fp = fopen("xyz.txt", "r");
if (!fp) {
...
}
Thanks.
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