View Compilation Error

0_0_18898955_4264.cpp: In function 'ww crot(ww)':
0_0_18898955_4264.cpp:36:2: error: 'B' was not declared in this scope
  B[0][1]=A[0][0];B[1][1]=A[0][1];B[1][0]=A[1][1];B[0][0]=A[1][0];
  ^