code: public static String stringFor(int k)
      {
          switch (k)
          {
              case cudaMemcpyHostToHost: return "cudaMemcpyHostToHost";
              case cudaMemcpyHostToDevice: return "cudaMemcpyHostToDevice";
              case cudaMemcpyDeviceToHost: return "cudaMemcpyDeviceToHost";
              case cudaMemcpyDeviceToDevice: return "cudaMemcpyDeviceToDevice";
              case cudaMemcpyDefault: return "cudaMemcpyDefault";
          }
          return "INVALID cudaMemcpyKind: "+k;
      }
docs: Returns the String identifying the given cudaMemcpyKind
  
  @param k The cudaMemcpyKind
  @return The String identifying the given cudaMemcpyKind