blocks|key|4548388|text|只有在初始化时声明char数组才能做到这一点|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4548389|message[]+=+"bar";|code-block|syntax|javascript|4548390|你不能在你的代码中这样做|4548391|要修改它，您可以使用<string.h>中的strcpy|offset|length|style|CODE|4548392|strcpy(message,+"bar");|4548393|entityMap^0|0|0|0|A|A|M|6|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|V|8|@$K|W|L|X|M|N]|$K|Y|L|Z|M|N]]|9|@]|A|$]]|$1|O|3|P|5|D|7|10|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

you can do that only in the initialisation when you declare the char array

<pre><code>message[] = "bar";
</code></pre>

You can not do it in your code

To modify it you can use <code>strcpy</code> from <code>&lt;string.h&gt;</code>

<pre><code>strcpy(message, "bar");
</code></pre>

blocks|key|5030982|text|在声明之后不能像那样使用字符数组。如果你想给你的字符数组赋值，你可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5030983|strcpy(message,+"bar");|code-block|syntax|javascript|5030984|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You cannot use character array like that after declaration. If you want to assign new value to your character array, you can do it like this: -

<pre><code>strcpy(message, "bar");
</code></pre>

blocks|key|5031025|text|像这样的任务|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5031026|message[]+=+"bar";|code-block|syntax|javascript|5031027|或|5031028|message+=+"bar";|5031029|C语言不支持。|5031030|初始赋值之所以有效，是因为它实际上是伪装成赋值的数组初始化。编译器解释|5031031|char+message[]="foo";|5031032|作为|5031033|char+message[4]+=+{'f',+'o',+'o',+'\0'};|5031034|实际上这里没有涉及到字符串文字"foo"。|offset|length|style|CODE|5031035|但当你试着|5031036|message+=+"bar";|5031037|"bar“被解释为实际的字符串文字，不仅如此，而且message不是一个可修改的左值，即。你不能给它赋值。如果你想修改你的数组，你必须一个字符一个字符地修改：|5031038|message[0]+=+'b';
message[1]+=+'a';|5031039|等，或者(最好)使用一个可以为您完成此任务的库函数，如strcpy()。|5031040|entityMap^0|0|0|0|0|0|0|0|0|0|F|5|0|0|0|P|7|0|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1D|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1E|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|1F|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|1G|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1H|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|1I|8|@]|9|@]|A|$E|F]]|$1|Q|3|R|5|6|7|1J|8|@]|9|@]|A|$]]|$1|S|3|T|5|D|7|1K|8|@]|9|@]|A|$E|F]]|$1|U|3|V|5|6|7|1L|8|@$W|1M|X|1N|Y|Z]]|9|@]|A|$]]|$1|10|3|11|5|6|7|1O|8|@]|9|@]|A|$]]|$1|12|3|13|5|D|7|1P|8|@]|9|@]|A|$E|F]]|$1|14|3|15|5|6|7|1Q|8|@$W|1R|X|1S|Y|Z]]|9|@]|A|$]]|$1|16|3|17|5|D|7|1T|8|@]|9|@]|A|$E|F]]|$1|18|3|19|5|6|7|1U|8|@]|9|@]|A|$]]|$1|1A|3|-4|5|6|7|1V|8|@]|9|@]|A|$]]]|1B|$]]

Assignments like

<pre><code>message[] = "bar";
</code></pre>

or

<pre><code>message = "bar";
</code></pre>

are not supported by C.

The reason the initial assignment works is that it's actually array initialization masquerading as assignment. The compiler interprets

<pre><code>char message[]="foo";
</code></pre>

as

<pre><code>char message[4] = {'f', 'o', 'o', '\0'};
</code></pre>

There is actually no string literal <code>"foo"</code> involved here.

But when you try to

<pre><code>message = "bar";
</code></pre>

The "bar" is interpreted as an actual string literal, and not only that, but <code>message</code> is not a modifiable lvalue, ie. you can't assign stuff to it. If you want to modify your array you must do it character by character:

<pre><code>message[0] = 'b';
message[1] = 'a';
</code></pre>

etc, or (better) use a library function that does it for you, like strcpy().

blocks|key|363468|text|你不能像这样改变字符数组。如果您想更改字符数组的值，则必须通过修改单个字符来更改它，或者您可以使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|363469|strcpy(message,"bar");|code-block|syntax|javascript|363470|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You cant change the character array like this . If you want to change the value of character array then you have to change it by modifying single character or you can use

<pre><code>strcpy(message,"bar");
</code></pre>

blocks|key|1198944|text|char+message[]="foo";|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1198945|此语句使编译器创建4个字符的内存空间此内存簇的地址是message的指针值。message的地址是不可更改的，您不能更改它指向的地址。在这种情况下，您唯一的机会就是更改message指向的数据。|unstyled|offset|length|style|CODE|1198946|char*+message="foo"|1198947|此时，会创建内存来存储指针的地址，因此message指针所在的地址可以在执行过程中更改。然后您就可以安全地执行message="bar"了|1198948|entityMap^0|0|Q|7|12|7|2C|7|0|0|J|7|1J|D|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@$G|S|H|T|I|J]|$G|U|H|V|I|J]|$G|W|H|X|I|J]]|9|@]|A|$]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$B|C]]|$1|M|3|N|5|F|7|Z|8|@$G|10|H|11|I|J]|$G|12|H|13|I|J]]|9|@]|A|$]]|$1|O|3|-4|5|F|7|14|8|@]|9|@]|A|$]]]|P|$]]

<pre><code>char message[]="foo";
</code></pre>

This statement cause compiler to create memory space of 4 char variable.Starting address of this memory cluster is pointer value of <code>message</code>. address of <code>message</code> is unchangeable, you cannot change the address where it points . In this case, your only chance is changing the data pointed by <code>message</code>. 

<pre><code>char* message="foo"
</code></pre>

In this time, memory is created to store the address of pointer, so the address where <code>message</code> point can change during execution. Then you can safely do <code>message="bar"</code>

Consider the following code.

<pre><code>char message[]="foo";

void main(void){
 message[] = "bar";
}
</code></pre>

Why is there a syntax error in MPLAB IDE v8.63? I am just trying to change the value of character array.

Cannot modify char array

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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考虑下面的代码。char message[]="foo";void main(void){    message[] = "bar";}为什么MPLAB IDE v8.63中存在语法错误？我只是尝试更改字符数组的值。

问无法修改char数组
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问无法修改char数组EN