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   bc.1p    ( 1 )

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Примеры (Examples)

In the shell, the following assigns an approximation of the first
       ten digits of 'π' to the variable x:

           x=$(printf "%s\n" 'scale = 10; 104348/33215' | bc)

       The following bc program prints the same approximation of 'π',
       with a label, to standard output:

           scale = 10
           "pi equals "
           104348 / 33215

       The following defines a function to compute an approximate value
       of the exponential function (note that such a function is
       predefined if the -l option is specified):

           scale = 20
           define e(x){
               auto a, b, c, i, s
               a = 1
               b = 1
               s = 1
               for (i = 1; 1 == 1; i++){
                   a = a*x
                   b = b*i
                   c = a/b
                   if (c == 0) {
                        return(s)
                   }
                   s = s+c
               }
           }

       The following prints approximate values of the exponential
       function of the first ten integers:

           for (i = 1; i <= 10; ++i) {
               e(i)
           }