为什么这段代码不起作用？如何使用cout函数显示代码？ [英] Why doesn't this code work and how do I use cout function to display the code?

问题描述

#include <iostream>
using namespace std;

int main()
{
    int myArr[x];
    
    for (x=0;x<5;x++)
    {
        myArr[x]=42;
    }
    
    return 0;
}

我的尝试：

What I have tried:

$g++ -o main *.cpp
main.cpp: In function ‘int main()’:
main.cpp:6:15: error: ‘x’ was not declared in this scope
     int myArr[x];
               ^
main.cpp:10:9: error: ‘myArr’ was not declared in this scope
         myArr[x]=42;

推荐答案

g ++ -o main * .cpp
main.cpp：在函数'int main（）'中：
main.cpp：6：15：错误：'x'未在此范围内声明
int myArr [x];
^
main.cpp：10：9：错误：'myArr'未在此范围内声明
myArr [x] = 42;

g++ -o main *.cpp main.cpp: In function ‘int main()’: main.cpp:6:15: error: ‘x’ was not declared in this scope int myArr[x]; ^ main.cpp:10:9: error: ‘myArr’ was not declared in this scope myArr[x]=42;

Quote：

为什么这段代码不起作用？

Why doesn't this code work ?

As在错误消息中说

As said in error message

main.cpp:6:15: error: ‘x’ was not declared in this scope
     int myArr[x];
               ^

int main()
{
    int myArr[x];  // What the x on this line ? What is its value ?
                   // that is what the compiler is asking you.
                   // The line is declaring an array, but what is the size ?
    for (x=0;x<5;x++)
    {
        myArr[x]=42;
    }
    
    return 0;
}

您应该遵循几个教程来帮助您入门。

You should really follow a couple tutorials to get you started.

C++适合初学者 - Google搜索 [ ^ ]

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