      void Init(void)
      {
        for(int i = 0;i < 19;i++) {
#ifdef DEBUG_QMCODER
          char string[5] = "X0  ";
          string[1] = (i / 10) + '0';
          string[2] = (i % 10) + '0';
          X[i].Init(string);
          string[0] = 'M';
          M[i].Init(string);
#else
          X[i].Init();
          M[i].Init();
#endif
        }
      }
The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.