C ++代码编译错误 [英] C++ code compiling error

问题描述

有人知道为什么在

io.cpp：

# include <iostream>
int ReadNumber()
{
    using namespace std;
    cout << "Enter a number: ";
    int x;
    cin >> x;
    return x;
}

void WriteAnswer(int x)
{
    using namespace std;
    cout << "The answer is " << x << endl;
}

main.cpp：

int ReadNumber();
void WriteAnswer(int x);

int main()
{
    int x = ReadNumber();
    int y = ReadNumber();
    WriteAnswer(x+y);
    return 0;
}

在Readnumber（）中没有int x;向前声明在main.cpp？当我把int x放在括号内时，编译器说：''函数不接受0个参数'

there is no int x in the Readnumber(); forward declaration in main.cpp? when I do put int x inside the brackets, the compiler says that: ''function does not take 0 arguments''

推荐答案

int ReadNumber();

这个函数声明在main中表示你的ReadNumber函数没有参数，

this function declaration in main indicate that your ReadNumber function takes no parameters and will return an int.

如果您在ReadNumber声明（在main.cpp中）和定义（在io.cpp中）中添加int x作为参数：

If you add int x as parameter in ReadNumber declaration (in main.cpp) and definition (in io.cpp) :

int ReadNumber(int x)

函数调用此函数必须包含一个整数作为参数。这就是为什么你得到的消息''函数不接受0参数''：你正在调用一个函数等待1参数，你的函数不调用包括任何。

your function calls to this function must then include an integer as parameter. That is why you get the message ''function does not take 0 arguments'' : you are calling a function that awaits 1 parameter and yours calls to the function doesnt include any.

下面是一个包含参数的ReadNumber函数调用示例：

Here is an example of ReadNumber function call including a parameter:

int YourParamUsedInReadNumber = 0;    
int x = ReadNumber(YourParamUsedInReadNumber); 

如注释中所建议的，你应该得到一个好的C ++书，之后再继续。

As suggested in comments, you should probably get a good C++ book to get a good grip on programming basics before going further.

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