不兼容的类型在赋值char？ [英] incompatible types in assignment of char?

问题描述

我收到此代码的错误。 '在char的赋值中不兼容的类型char [13]'我无法弄清楚如何初始化这些数组并使它工作。基本上，程序采用ISBN代码（4组整数，并在每组数字之间用一个字符串 - ），并验证它们是否正确。该程序使用一个ISBN类和一个加载实际ISBN代码的主函数，并尝试使用类ISBN来测试它们。这是我有的。

I am getting an error with this code. 'Incompatible types in assignment of char to char[13]' I can't figure out how to initialize these arrays and make this work. Basically, the program takes ISBN codes (4 groups of integers and makes one string with '-' in them between each group of numbers) and verifies that they are correct. The program uses a class ISBN and a main function that loads the actual ISBN codes and tries to use the class ISBN to test them. Here is what I have.

class ISBN {
private:
char group[6];                          
char publisher[8];                     
char book[8];                      
char check;  
char isbn[13];
char compute_check();

public:
ISBN();
ISBN(char newisbn[]);             
ISBN(char group[ ], char publisher[ ], char book[ ], char check);                                       
bool valid();                           
char *getpublisher();                  
void print(ostream &o);                 
};

ISBN::ISBN(char newisbn[]) : isbn(newisbn) {}

$ b b

程序加载这些ISBN号码，然后使用类ISBN打印并测试它们，方法如下：

The program loads these ISBN numbers and then prints and tests them using the class ISBN in the following way...

strcpy(isbns[index++], "1-57676-074-X");
ISBN isbn(isbns[i]);
isbn.print(cout);
if (isbn.valid())

我无法转换ISBN代码进入ISBN类，以便它们可以由这些功能中的每一个操作。任何帮助非常感谢！感谢！

I'm having trouble converting the ISBN codes into the ISBN class so that they can be operated on by each of these functions. Any help much appreciated! Thanks!

推荐答案

这：

ISBN::ISBN(char newisbn[]) : isbn(newisbn) {}

做你想要的。尽管你可能已经被告知，数组和指针是不一样的 - 这里的构造函数是一个指针（伪装成一个数组），并尝试使用它来初始化一个实际的数组。您需要：

doesn't do what you want. Despite what you may have been told, arrays are not identical with pointers - the constructor here is taking a pointer (disguised as an array) and trying to use it to initialise an actual array. You need:

ISBN::ISBN(char newisbn[]) {
   strcpy( isbn, newisbn );
}

我还建议调查std :: string类的一般string-处理需求。

I would also suggest investigating the std::string class for your general string-processing needs.

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