分裂...奇怪的行为，我不明白 [英] division... strange behaviour i dont understand
问题描述
可以请某人解释为什么我收到消息框？
我该死的舒尔500除以300不等于零; -\
__________________________________
unsigned short uiNumbers = 500;
unsigned float ufFactor = 300.0;
ufFactor = ufFactor / uiNumbers;
if（ufFactor == 0）AfxMessageBox（" 0"）
can please someone explain why i get the message-box?
im damn shure 500 divided by 300 doesnt equal to zero ;-\
__________________________________
unsigned short uiNumbers = 500;
unsigned float ufFactor = 300.0;
ufFactor = ufFactor / uiNumbers;
if (ufFactor == 0) AfxMessageBox("0");
推荐答案
cl *** @ yahoo.de 写道：
可以请有人解释为什么我收到消息框？
我该死的舒尔500除以300不等于零; -\
__________________________________
unsigned short uiNumbers = 500;
unsigned float ufFactor = 300.0;
can please someone explain why i get the message-box?
im damn shure 500 divided by 300 doesnt equal to zero ;-\
__________________________________
unsigned short uiNumbers = 500;
unsigned float ufFactor = 300.0;
什么是未签名的浮动？
-
Ian Collins。
What''s an unsigned float?
--
Ian Collins.
Ian Collins写道：
Ian Collins wrote:
cl *** @ yahoo.de 写道：
可以请有人解释为什么我收到消息框？
im该死的500除以300不等于零; -\
__________________________________
unsigned short uiNumbers = 500;
unsigned float ufFactor = 300.0;
can please someone explain why i get the message-box?
im damn shure 500 divided by 300 doesnt equal to zero ;-\
__________________________________
unsigned short uiNumbers = 500;
unsigned float ufFactor = 300.0;
什么是未签名的浮动？
-
Ian Collins。
What''s an unsigned float?
--
Ian Collins.
是的，我的编译器没有编译的无符号浮点数。
yes, unsigned float that is not compiling on my compiler.
im damn shure 500除以300不等于零; -
im damn shure 500 divided by 300 doesnt equal to zero ;-
ufFactor = ufFactor / uiNumbers;
ufFactor = ufFactor / uiNumbers;
无论如何，这不是500/300。
是300/500。应该导致0.6如果ufFactor是浮动的那么。
如果是积分则为0。
- Murali Krishna
any way, that''s not 500 / 300.
it is 300 / 500. Should lead to 0.6 if ufFactor is float.
and 0 if it is integral.
-- Murali Krishna
2006年7月9日21:32:18 -0700， cl***@yahoo.de 写道：
On 9 Jul 2006 21:32:18 -0700, cl***@yahoo.de wrote:
>可以请某人解释为什么我收到消息框？
我该死的舒尔500除以300不等于零; -\
__________________________________
unsigned short uiNumbers = 500;
unsigned float ufFactor = 300.0;
ufFactor = ufFactor / uiNumbers;
if（ufFactor == 0）AfxMessageBox（" 0 QUOT）;
>can please someone explain why i get the message-box?
im damn shure 500 divided by 300 doesnt equal to zero ;-\
__________________________________
unsigned short uiNumbers = 500;
unsigned float ufFactor = 300.0;
ufFactor = ufFactor / uiNumbers;
if (ufFactor == 0) AfxMessageBox("0");
unsigned float？
无论如何，似乎ufFactor（应该具有值300.0 / 500）
在被比较之前被转换为int（因此，舍入为0）。
尝试：
if（ufFactor = = 0.0）AfxMessageBox（0）;
这是一个棘手的比较，与双打（和浮点数）比较
受制于大量四舍五入造成的问题。你应该看一下
这个列表，siblig list comp.lang.c ++。moderated和cousin lists
comp.lang.c和comp.lang.c.moderated关于浮点比较
问候，
Zara
unsigned float?
Anyway, it seems thta ufFactor (which should have the value 300.0/500)
is converted to int (thus, rounded to 0) before being compared.
Try :
if (ufFactor == 0.0) AfxMessageBox("0");
This is an tricky comparison, as comparison with doubles (and floats)
is subject to lots of problems due to rounding. You should take a look
at this list, siblig list comp.lang.c++.moderated and cousin lists
comp.lang.c and comp.lang.c.moderated about floating point comparisons
Regards,
Zara
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