如何构造Char数组

我有以下代码尝试枚举字符串.

#include 
#include 

using namespace std;

string base = "000";
char values[] = {'0', '1', '2', '3' }; // Error Here

for (int i = 0; i < base.length(); ++i)
{
   for (int j = 0; j < countof(values); ++j)
   {
      if (base[i] != values[j])
      {
          string copy = base;
          copy[i] = values[j];
          cout << copy << endl;

          for (int k = i+1; k < base.length(); ++k)
          {
              for (int l = 0; l < countof(values); ++l)
              {
                   if (copy[k] != values[l])
                   {
                       string copy2 = copy;
                       copy[k] = values[l];
                       cout << copy2 << endl;
                   }
              }
          }
      }
   }
}

但是如何编译却给出了错误:

test.cc:9: error: expected unqualified-id before 'for'
test.cc:9: error: expected constructor, destructor, or type conversion before '<' token
test.cc:9: error: expected unqualified-id before '++' token

Miles.. 5

错误实际上是在for循环中的以下行:您的代码需要包含在某种函数中,最有可能int main(void)

错误实际上是在for循环中的以下行:您的代码需要包含在某种函数中,最有可能int main(void)