gcc/testsuite/gcc.misc-tests/acker1.c

   1 #include <stdio.h>
   2
   3 int acker(int, int);
   4
   5 int
   6 main(void)
   7 {
   8     int n = acker(3,6);
   9     if (n != 509)
  10         printf("acker(3,6) = %d != 509\n", n);
  11     return(0);
  12 }
  13
  14 int
  15 acker(int x,int y)
  16 {
  17     if (x==0)
  18         return(y+1);
  19     else if (y==0)
  20         return(acker(x-1,1));
  21     else
  22         return(acker(x-1, acker(x, y-1)));
  23 }