C++ 错误：“必须使用大括号括起来的初始化程序初始化数组”
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C++ error: "Array must be initialized with a brace enclosed initializer"
提问by Charles Salvia
I am getting the following C++ error:
我收到以下 C++ 错误：
array must be initialized with a brace enclosed initializer
From this line of C++
从这行 C++
int cipher[Array_size][Array_size] = 0;
What is the problem here? What does the error mean? Below is the full code:
这里有什么问题？错误是什么意思？下面是完整的代码：
string decryption(string todecrypt)
{
int cipher[Array_size][Array_size] = 0;
string ciphercode = todecrypt.substr(0,3);
todecrypt.erase(0,3);
decodecipher(ciphercode,cipher);
string decrypted = "";
while(todecrypt.length()>0)
{
string unit_decrypt = todecrypt.substr(0,Array_size);
todecrypt.erase(0,Array_size);
int tomultiply[Array_size]=0;
for(int i = 0; i < Array_size; i++)
{
tomultiply[i] = int(unit_encrypt.substr(0,1));
unit_encrypt.erase(0,1);
}
for(int i = 0; i < Array_size; i++)
{
int resultchar = 0;
for(int j = 0; j<Array_size; j++)
{
resultchar += tomultiply[j]*cipher[i][j];
}
decrypted += char((resultchar%229)-26);
}
}
return decrypted;
}
回答by Charles Salvia
The syntax to statically initialize an array uses curly braces, like this:
静态初始化数组的语法使用大括号，如下所示：
int array[10] = { 0 };
This will zero-initialize the array.
这将对数组进行零初始化。
For multi-dimensional arrays, you need nested curly braces, like this:
对于多维数组，您需要嵌套的花括号，如下所示：
int cipher[Array_size][Array_size]= { { 0 } };
Note that Array_sizemust be a compile-time constant for this to work. If Array_sizeis not known at compile-time, you must use dynamic initialization. (Preferably, an std::vector).
请注意，Array_size必须是编译时常量才能使其工作。如果Array_size在编译时未知，则必须使用动态初始化。（最好是一个std::vector）。
回答by MahlerFive
You cannot initialize an array to '0' like that
您不能像那样将数组初始化为“0”
int cipher[Array_size][Array_size]=0;
You can either initialize all the values in the array as you declare it like this:
您可以在声明数组时初始化数组中的所有值，如下所示：
// When using different values
int a[3] = {10,20,30};
// When using the same value for all members
int a[3] = {0};
// When using same value for all members in a 2D array
int a[Array_size][Array_size] = { { 0 } };
Or you need to initialize the values after declaration. If you want to initialize all values to 0 for example, you could do something like:
或者您需要在声明后初始化值。例如，如果要将所有值初始化为 0，则可以执行以下操作：
for (int i = 0; i < Array_size; i++ ) {
a[i] = 0;
}
回答by Nathan Fellman
You can't initialize arrays like this:
你不能像这样初始化数组：
int cipher[Array_size][Array_size]=0;
The syntax for 2D arrays is:
二维数组的语法是：
int cipher[Array_size][Array_size]={{0}};
Note the curly braces on the right hand side of the initialization statement.
请注意初始化语句右侧的花括号。
for 1D arrays:
对于一维数组：
int tomultiply[Array_size]={0};
