c++ error: array bound is not an integer constant before ']' token

    int h = 0;

    cout << "input an interge:";

    cin >> h;

    cout << h << endl;

    const int kl = h;

    char buf[kl];

    typedef struct tmpStru{    

        char field[kl];           // 即使在上面声明了 kl 为 const int，这边也是无法编译过去的

    }tmpStru;