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1. You are to write three programs which produce the following outputs. Each program will use one of the three loop structures, for, do-while, and while. This will be done in two stages. The first will count from 0 to 20 in decimal, octal, and hexadecimal. The second will add binary.

     Dec  Hex   Oct
       0    0     0 
       1    1     1 
       2    2     2 
       3    3     3 
       4    4     4 
       5    5     5 
       6    6     6 
       7    7     7 
       8    8    10 
       9    9    11 
      10    A    12 
      11    B    13 
      12    C    14 
      13    D    15 
      14    E    16 
      15    F    17 
      16   10    20 
      17   11    21 
      18   12    22 
      19   13    23 
      20   14    24 
   

     Dec      Bin   Hex   Oct
       0        0     0     0 
       1        1     1     1 
       2       10     2     2 
       3       11     3     3 
       4      100     4     4 
       5      101     5     5 
       6      110     6     6 
       7      111     7     7 
       8     1000     8    10 
       9     1001     9    11 
      10     1010     a    12 
      11     1011     b    13 
      12     1100     c    14 
      13     1101     d    15 
      14     1110     e    16 
      15     1111     f    17 
      16    10000    10    20 
      17    10001    11    21 
      18    10010    12    22 
      19    10011    13    23 
      20    10100    14    24