Re: JavaSchools (was Re: Colon Operator: Superfluous Syntax?)

[Rici Lake <lua@...>]

Alex Queiroz wrote:Could you
> write a C example mimicking the scheme example I gave, without
> exploding the stack?

And here it is:
rici@rici-desktop:~/src/fact$ cat fact.c
#include <stdlib.h>
#include <stdio.h>

double fact(int n, double accum) {
  if (n <= 1) return accum;
  else return fact(n-1, n * accum);
}

int printfact(char **argv, int count) {
  if (*argv) {
    int n = atoi(*argv);
    printf("%d! = %.17g%s\n", n, fact(n, 1), n > 18 ? " (more or less)" 
: "");
    return printfact(argv + 1, count + 1);
  }
  else return count;
}

int main (int argc, char **argv) {
  printf("%d factorials printed\n", printfact(argv+1, 0));
  return 0;
}


rici@rici-desktop:~/src/fact$ gcc -O2 -Wall -o fact fact.c
rici@rici-desktop:~/src/fact$ ./fact 0 1 2 3 4 10 15 20 1000 1000000 
10000000
0! = 1
1! = 1
2! = 2
3! = 6
4! = 24
10! = 3628800
15! = 1307674368000
20! = 2.43290200817664e+18 (more or less)
1000! = inf (more or less)
1000000! = inf (more or less)
10000000! = inf (more or less)
11 factorials printed