#include <iostream.h>
// file: pow2.cc
// while loops, functions, width
// while loops
// example for creating a math table

int pow(int num, int exp)
// precondition: reasonable int num and
//   small positive int exp
// postcondition: returns num^exp
{
   int prod = 1, i = 0;

   while (i < exp)
   {
      prod *= num;
      i++;
   }
   return prod;
}

int main()
{
   int size, j = 0;

   cout << "Specify table size (be modest!): ";
   cin >> size;
   cout << "  N  N^2   N^3    N^4     N^5       N^6" << endl;
   while ( j < size)
   {
      j++;
      cout.width(3);
      cout << j ;
      cout.width(5);
      cout << pow(j, 2);
      cout.width(6);
      cout << pow(j, 3);
      cout.width(7);
      cout << pow(j, 4);
      cout.width(8);
      cout << pow(j, 5);
      cout.width(10);
      cout << pow(j, 6) << endl;
   }
   return 0;
}

< pow2
><Specify table size (be modest!): 20
>   N  N^2   N^3    N^4     N^5       N^6
>   1    1     1      1       1         1
>   2    4     8     16      32        64
>   3    9    27     81     243       729
>   4   16    64    256    1024      4096
>   5   25   125    625    3125     15625
>   6   36   216   1296    7776     46656
>   7   49   343   2401   16807    117649
>   8   64   512   4096   32768    262144
>   9   81   729   6561   59049    531441
>  10  100  1000  10000  100000   1000000
>  11  121  1331  14641  161051   1771561
>  12  144  1728  20736  248832   2985984
>  13  169  2197  28561  371293   4826809
>  14  196  2744  38416  537824   7529536
>  15  225  3375  50625  759375  11390625
>  16  256  4096  65536 1048576  16777216
>  17  289  4913  83521 1419857  24137569
>  18  324  5832 104976 1889568  34012224
>  19  361  6859 130321 2476099  47045881
>  20  400  8000 160000 3200000  64000000