Editing B (programming language) (section)

== Examples ==
The following examples are from the ''Users' Reference to B'' by Ken Thompson:<ref name=bur />

<syntaxhighlight lang="c">
/* The following function will print a non-negative number, n, to
   the base b, where 2<=b<=10.  This routine uses the fact that
   in the ASCII character set, the digits 0 to 9 have sequential
   code values.  */

printn(n,b) {
   extrn putchar;
   auto a;
   /* Wikipedia note: the auto keyword declares a variable with
      automatic storage (lifetime is function scope), not
      "automatic typing" as in C++11. */

   if(a=n/b) /* assignment, not test for equality */
      printn(a, b); /* recursive */
   putchar(n%b + '0');
}
</syntaxhighlight>

<syntaxhighlight lang="c">
/* The following program will calculate the constant e-2 to about
   4000 decimal digits, and print it 50 characters to the line in
   groups of 5 characters.  The method is simple output conver-
   sion of the expansion
      1/2! + 1/3! + ... = .111...
   where the bases of the digits are 2, 3, 4, ... */

main() {
   extrn putchar, n, v;
   auto i, c, col, a;

   i = col = 0;
   while(i<n)
      v[i++] = 1;

   while(col<2*n) {
      a = n+1;
      c = i = 0;
      while(i<n) {
         c =+ v[i]*10;
         v[i++] = c%a;
         c =/ a--;
      }
      putchar(c+'0');
      if(!(++col%5))
         putchar(col%50?' ':'*n');
   }
   putchar('*n*n');
}

v[2000];
n 2000;
</syntaxhighlight>