Problem Statement

Create a program to continually calculate and output the next decimal digit of

π

{\displaystyle \pi }

(pi). The program should continue forever (until it is aborted by the user) calculating and outputting each decimal digit in succession. The output should be a decimal sequence beginning   3.14159265 ...

Note: this task is about   calculating   pi.   For information on built-in pi constants see Real constants and functions.

Related Task Arithmetic-geometric mean/Calculate Pi

Let's start with the solution:

pi=: 3 :0
  echo"0 '3.1'
  i=. 0
  while. i=. i + 1 do.
    echo -/ 1 10 * <.@o. 10x ^ 1 0 + i
  end.
)


   pi''
3
.
1
4
1
5
9
2
6
5
3
...