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    <p>The <a href="http://www.gnu.org/software/libc/manual/html_mono/libc.html#Streams-and-I18N" rel="nofollow">manual</a> says, more fully:</p> <blockquote> <p>Being able to use the same stream for wide and normal operations comes with a restriction: a stream can be used either for wide operations or for normal operations. Once it is decided there is no way back. Only a call to freopen or freopen64 can reset the orientation. The orientation can be decided in three ways:</p> <ul> <li>If any of the normal character functions is used (this includes the fread and fwrite functions) the stream is marked as not wide oriented.</li> <li>If any of the wide character functions is used the stream is marked as wide oriented.</li> <li>The fwide function can be used to set the orientation either way.</li> </ul> <p>It is important to never mix the use of wide and not wide operations on a stream. There are no diagnostics issued. The application behavior will simply be strange or the application will simply crash. The fwide function can help avoiding this.</p> </blockquote> <p>Note that the Microsoft documentation says their <code>fwide()</code> is "not implemented" (it's a no-op) and it "does not comply with the standard."</p> <p>My reading of all this is that programs using glibc must not use both narrow and wide character functions on a single stream without reopening it. Perhaps on Microsoft platforms there is no such restriction; perhaps even other libc implementations are more flexible.</p>
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    1. POwhat is the orientation of a stdout in C
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    1. USJohn Zwinck
    1. USJohn Zwinck
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    1. COI don't see the differences between the two quoted manuals.
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      1. USzakinster
    2. CO@zakinster: you're right, I'll remove that part of my answer. It shouldn't change the main ideas.
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      1. USJohn Zwinck
    3. COok then, i will try on my linux
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      1. USsuitianshi
 

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