[R] if else with 4 conditions problem

[smart hendsome]

Hi everyone,
I have two columns:
   A               B
   1               1   1               0
   0               1
   0               0

I have 4 categories which are:
1) if A = 1 and B =1 then A1 = 1, else A2 = 0, A3 = 0, A4 = 0
2) if A = 1 and B =0 then A1 = 0, else A2 =1, A3 = 0, A4 = 0

3) if A = 0 and B = 1 then A1 = 0, else A2 = 0, A3 = 1, A4 = 0

4) if A = 0 and B =0 then A1 = 0, else A2 = 0, A3 = 0, A4 = 1

I want the data become like below:
   A        B      A1      A2    A3     A4
   1        1       1        0        0      0   1        0       0        1        0      0
   0        1       0        0        1      0
   0        0       0        0        0      1
Anyone can help me? Many Thanks.
Regards,
Zuhri


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