C++ error: "Array must be initialized with a brace enclosed initializer" -

i getting following c++ error:

array must initialized brace enclosed initializer  

from line of c++

int cipher[array_size][array_size]; 

what problem here? error mean? below full code:

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 = 0; < array_size; i++)         {             tomultiply[i] = int(unit_encrypt.substr(0,1));             unit_encrypt.erase(0,1);         }         for(int = 0; < 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; } 

the syntax statically initialize array uses curly braces, this:

int array[10] = { 0 }; 

this zero-initialize array.

for multi-dimensional arrays, need nested curly braces, this:

int cipher[array_size][array_size]= { { 0 } }; 

note array_size must compile-time constant work. if array_size not known @ compile-time, must use dynamic initialization. (preferably, std::vector).