blocks|key|1367194|text|简短的(也是唯一的)答案是:不，您不能访问在其他函数中本地声明的变量。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1367195|相反，将大小写不敏感作为参数传递给函数。|1367196|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

The short (and only) answer is: No, you can't access variables declared locally in other functions.

Instead pass the case-insensitivity as an argument to the function.

blocks|key|1911219|text|通常，如果您需要重用代码，请将其包装在它自己的函数中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1911220|在这种情况下，为什么只需要从toupper+main调用|offset|length|style|CODE|1911221|...

++if+(toupper(ch1)+!=+toupper(ch2))
++{
+++++printf(+"files+differ:+char+%25d\n",+differ+);
+++++return+1;
++}
+...
++while(+(+!feof(+file1+)+)+&&+(+!feof(+file2+)+)+&&+(toupper(ch1)+==+toupper(ch2))+);|code-block|syntax|javascript|1911222|或者将不区分大小写的比较包装到一个函数中：|1911223|int+caseinvariantcomp(char+c1,+char+c2)+{
++++return+toupper(c1)+-+toupper(c2);
}

...

++if+(caseinvariantcomp(ch1,+ch2))
++{
+++++printf(+"files+differ:+char+%25d\n",+differ+);
+++++return+1;
++}
+...
++while(+(+!feof(+file1+)+)+&&+(+!feof(+file2+)+)+&&+(!caseinvariantcomp(ch1,+ch2))+);|1911224|entityMap^0|0|E|7|M|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]|$D|W|E|X|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|Y|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|Z|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

In general, if you need to reuse code, wrap it in its own function.

In this case, why could just call <code>toupper</code> from <code>main</code>:

<pre><code>...

 if (toupper(ch1) != toupper(ch2))
 {
 printf( "files differ: char %d\n", differ );
 return 1;
 }
 ...
 while( ( !feof( file1 ) ) &amp;&amp; ( !feof( file2 ) ) &amp;&amp; (toupper(ch1) == toupper(ch2)) );
</code></pre>

or wrap the case-insensitive comparison into a function:

<pre><code>int caseinvariantcomp(char c1, char c2) {
 return toupper(c1) - toupper(c2);
}

...

 if (caseinvariantcomp(ch1, ch2))
 {
 printf( "files differ: char %d\n", differ );
 return 1;
 }
 ...
 while( ( !feof( file1 ) ) &amp;&amp; ( !feof( file2 ) ) &amp;&amp; (!caseinvariantcomp(ch1, ch2)) );
</code></pre>

blocks|key|4377442|text|很长的答案(没有测试，但你应该知道)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4377443|int+Compare(char+ch1,+char+ch2,+int+ignorecase)
{
++if+(ignorecase)
++{
++++ch1+=+toupper(ch1)+;
++++ch2+=+toupper(ch2)+;
++}

++return+ch1+==+ch2+;
}


int+CharacterCompare(+FILE+*file1,+FILE+*file2,+char+file1name[],+char+file2name[],
++++++++++++++++++++++int+ignorecase+)
{
+++int+ch1,+ch2;
+++int+differ+=+0;

+++do
+++{
++++ch1+=+fgetc(+file1+);
++++++ch2+=+fgetc(+file2+);
++++++differ%2B%2B;

++++++if+(+feof(+file1+)+&&+!feof(+file2+)+)
++++++{++
+++++++++printf(+"EOF+on+%25s\n",+file1name+);
+++++++++return+1;+++++++++
++++++}
++++++else+if+(+feof(+file2+)+&&+!feof(+file1)+)
++++++{
+++++++++printf(+"EOF+on+%25s\n",+file2name+);
+++++++++return+1;
++++++}

++++++if+(Compare(ch1,+ch2,+ignorecase))
++++++{
+++++++++printf(+"files+differ:+char+%25d\n",+differ+);
+++++++++return+1;
++++++}+++++
+++}+
+++while(+(+!feof(+file1+)+)+&&+(+!feof(+file2+)+)+&&+(ch1+==+ch2)+);

+++printf(+"files+are+equal\n"+);

+++return+0;
}|code-block|syntax|javascript|4377444|主要的例子是：|4377445|ignorecase+=+argv[1]+==+"-i"+;
int+different+=+CharacterCompare(f2,+f2,+name1,+name2,+ignorecase)+;|4377446|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Long answer (not tested, but you shoukld get the idea):

<pre><code>int Compare(char ch1, char ch2, int ignorecase)
{
 if (ignorecase)
 {
 ch1 = toupper(ch1) ;
 ch2 = toupper(ch2) ;
 }

 return ch1 == ch2 ;
}


int CharacterCompare( FILE *file1, FILE *file2, char file1name[], char file2name[],
 int ignorecase )
{
 int ch1, ch2;
 int differ = 0;

 do
 {
 ch1 = fgetc( file1 );
 ch2 = fgetc( file2 );
 differ++;

 if ( feof( file1 ) &amp;&amp; !feof( file2 ) )
 { 
 printf( "EOF on %s\n", file1name );
 return 1; 
 }
 else if ( feof( file2 ) &amp;&amp; !feof( file1) )
 {
 printf( "EOF on %s\n", file2name );
 return 1;
 }

 if (Compare(ch1, ch2, ignorecase))
 {
 printf( "files differ: char %d\n", differ );
 return 1;
 } 
 } 
 while( ( !feof( file1 ) ) &amp;&amp; ( !feof( file2 ) ) &amp;&amp; (ch1 == ch2) );

 printf( "files are equal\n" );

 return 0;
}
</code></pre>

And in main e.g something like :

<pre><code>ignorecase = argv[1] == "-i" ;
int different = CharacterCompare(f2, f2, name1, name2, ignorecase) ;
</code></pre>

I'm attempting to use this character compare function in main() while ignoring case sensitivity. Is there a way to call toupper(ch1) and toupper(ch2) from main so that if the -i (for case insensitivity) is raised I can reuse the code. 

<pre><code>int CharacterCompare( FILE *file1, FILE *file2, char file1name[], char file2name[] )
{
 int ch1, ch2;
 int differ = 0;

 do
 {

 ch1 = fgetc( file1 );
 ch2 = fgetc( file2 );
 differ++;

 if ( feof( file1 ) &amp;&amp; !feof( file2 ) )
 { 
 printf( "EOF on %s\n", file1name );
 return 1; 
 }
 else if ( feof( file2 ) &amp;&amp; !feof( file1) )
 {
 printf( "EOF on %s\n", file2name );
 return 1;
 }

 if (ch1 != ch2)
 {
 printf( "files differ: char %d\n", differ );
 return 1;
 } 
 } 
 while( ( !feof( file1 ) ) &amp;&amp; ( !feof( file2 ) ) &amp;&amp; (ch1 == ch2) );

 printf( "files are equal\n" );

 return 0;
}
</code></pre>

How do I access a function variable from main()

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我试图在main()中使用这个字符比较函数，同时忽略大小写敏感性。是否有一种方法从main调用to (Ch1)和ch2，以便如果引发-i (大小写不敏感)，我可以重用代码。int CharacterCompare( FILE *file1, FILE *file2, char file1name[], char fil...

问如何从main()访问函数变量
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