blocks|key|572633|text|您必须在函数使用之前声明它们，例如，在main之前声明，并使用调用函数的正确语法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|572634|例如|572635|//...
int+Enter(){+return+0;+}

int+Satisfies(){+return+0;+}
//...
int+main()
{
//...
case+1:
+++Enter();
//...|code-block|syntax|javascript|572636|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You have to declare the functions before their usage for example before main and use the correct syntax of calling functions.

For example

<pre><code>//...
int Enter(){ return 0; }

int Satisfies(){ return 0; }
//...
int main()
{
//...
case 1:
 Enter();
//...
</code></pre>

blocks|key|2476570|text|您需要在使用函数之前声明它们。所以把这个放在main上面|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2476571|int+Enter();
int+Satisfies();|code-block|syntax|javascript|2476572|您可以将定义(实际包含调用函数时要运行的代码的位)保留在原来的位置。或者，您可以将这些函数移到main之上，因为函数定义也是一个声明。|2476573|编译器需要在尝试调用函数之前查看这些位，这样它就可以知道它需要哪些参数，以及将返回什么。|2476574|See+this+question.|2476575|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/q/1410563/1171191^0|M|4|0|0|1B|4|0|0|0|I|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|15|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|16|8|@]|D|@$9|17|A|18|1|19]]|E|$]]|$1|Q|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

You need to declare the functions before they are used. So put this above <code>main</code>:

<pre><code>int Enter();
int Satisfies();
</code></pre>

You can leave the definitions (the bit that actually contains the code to run when the function is called) where they are. Or you can just move those functions above <code>main</code>, since a function definition is also a declaration.

The compiler needs to see these bits before it tries to call the function, so that it can know what arguments it needs, and what will be returned.

<a href="https://stackoverflow.com/q/1410563/1171191">See this question.</a>

blocks|key|5836301|text|在使用函数之前，您需要声明(或声明并定义)函数。并且您需要使用()进行函数调用。就像Enter()和Satisfied()一样。如果你想学习好的编程和C语言编码，然后去C%2B%2B，请阅读Dan+Godkin的"C+for+Dummies“。我最喜欢的编码书。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5836302|您有3种方法可以完成此操作并修复您的代码：|5836303|1.编写协议定义：|offset|length|style|BOLD|5836304|#include+<iostram>

int+Enter();
int+Satisfies();


using+namespace+std;

int+main()+
{++
+++//bla
}

int+Enter(){+return+0;+}
int+Satisfies(){+return+0;+}|code-block|syntax|javascript|5836305|2.创建一个函数.h文件，并将声明放在其中。将其保存在与c/+cpp文件相同的文件夹中|5836306|然后在您的代码中包含|5836307|#include+"function.h"|5836308|3将函数按执行顺序放在c/cpp文件中。函数必须在使用前声明。示例：|5836309|void+Enter()
{
++//bla
}

void+Satisfied()
{
++//blub
}

int+main()+
{
+Enter();
+Satisfied();
}|5836310|更棘手的例子是，当一个函数(满意的)使用另一个函数(+Enter+)时，必须在满足的函数之前声明Enter函数：|5836311|void+Enter()
{
++//bla
}

void+Satisfied()
{
++//blubb
++Enter();+//now+Enter+must+be+declared+before+is+Satisfied()+is+defined,+so+it+must+be+"over"+it+in+the+source+like+in+this+example
}

int+main()+
{
+Enter();
+Satisfied();
}|5836312|entityMap^0|0|0|0|9|0|0|0|10|0|0|0|0|Y|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|15|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|16|8|@$F|17|G|18|H|I]]|9|@]|A|$]]|$1|J|3|K|5|L|7|19|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|1A|8|@$F|1B|G|1C|H|I]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1D|8|@]|9|@]|A|$]]|$1|S|3|T|5|L|7|1E|8|@]|9|@]|A|$M|N]]|$1|U|3|V|5|6|7|1F|8|@$F|1G|G|1H|H|I]]|9|@]|A|$]]|$1|W|3|X|5|L|7|1I|8|@]|9|@]|A|$M|N]]|$1|Y|3|Z|5|6|7|1J|8|@]|9|@]|A|$]]|$1|10|3|11|5|L|7|1K|8|@]|9|@]|A|$M|N]]|$1|12|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]]|13|$]]

You need to declare (or declare and definite) a function before you use it. And you need to make function calls with (). Like Enter() and Satisfied(). If you want to learn good programming and C coding and then go to C++ read "C for Dummies" by Dan Godkin. My favourite coding book.

You have 3 ways to do this and fix your code:

1. Write prototy definitions:

<pre><code>#include &lt;iostram&gt;

int Enter();
int Satisfies();


using namespace std;

int main() 
{ 
 //bla
}

int Enter(){ return 0; }
int Satisfies(){ return 0; }
</code></pre>

2. Make a function.h file and put the declarations there. Save it in the same folder as the c / cpp file

then include in your code

<pre><code>#include "function.h"
</code></pre>

3 Put your functions in order of execution in the c/cpp file. A function must be declared before it is used. Example:

<pre><code>void Enter()
{
 //bla
}

void Satisfied()
{
 //blub
}

int main() 
{
 Enter();
 Satisfied();
}
</code></pre>

More tricky example, when a function (Satisfied) uses an other function (Enter) the Enter function must be declared before the Satisfied function:

<pre><code>void Enter()
{
 //bla
}

void Satisfied()
{
 //blubb
 Enter(); //now Enter must be declared before is Satisfied() is defined, so it must be "over" it in the source like in this example
}

int main() 
{
 Enter();
 Satisfied();
}
</code></pre>

blocks|key|3723579|text|函数调用需要在函数名后加上()，不管它是否接受任何参数。另外，你需要在main()之前定义函数头|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3723580|include+<iostream>
using+namespace+std;
int+Enter();
int+Satisfies();

int+main()+{
++++while+(1){
++++++++char+menu;
++++++++cin>>menu;
++++++++switch+(menu){
++++++++++++case+1:+Enter();+
++++++++++++++++break;
++++++++++++case+2:+Satisfies();+
++++++++++++++++break;
++++++++++++case+3:+
++++++++++++++++break;
++++++++};
++++};
}

int+Enter(){
++++return+0;
}

int+Satisfies(){
++++return+0;
}|code-block|syntax|javascript|3723581|entityMap^0|D|2|Z|6|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

Function call need to have <code>()</code> after the function name doesn't matter whether it take any parameter or not. Plus you need to define function header before <code>main()</code>

<pre><code>include &lt;iostream&gt;
using namespace std;
int Enter();
int Satisfies();

int main() {
 while (1){
 char menu;
 cin&gt;&gt;menu;
 switch (menu){
 case 1: Enter(); 
 break;
 case 2: Satisfies(); 
 break;
 case 3: 
 break;
 };
 };
}

int Enter(){
 return 0;
}

int Satisfies(){
 return 0;
}
</code></pre>

Hey guys I'm trying to learn C++ and I was doing pretty well until I hit this wall..

I am getting two errors:
error: 'enter' was not declared in this scope
error: 'Satisfies' was not declared in this scope|

Here is my file. Why is that?

<pre><code>include &lt;iostream&gt;

using namespace std;

int main() {
 while (1){
 char menu;
 cin&gt;&gt;menu;
 switch (menu){
 case 1: Enter(); break;
 case 2: Satisfies(); break;
 case 3: break;
 };
 };
}

int Enter(){
 return 0;
}

int Satisfies(){
 return 0;
}
</code></pre>

CodeBloks C++ Error: Was not declared in the scope

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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嘿，伙计们，我正在努力学习C++，在我撞到这堵墙之前，我一直做得很好..我收到两个错误:错误:没有在这个作用域中声明'enter‘错误:没有在这个作用域中声明'Satisfies’这是我的档案。为什么会这样呢？include <iostream>using namespace std;int main() { w...

问CodeBloks C++错误:未在作用域中声明
EN

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问CodeBloks C++错误:未在作用域中声明EN