/* *	This simple classical example of recursion is useful for *	testing stack backtraces and such. */#ifdef vxworks#  include <stdio.h>/* VxWorks does not supply atoi.  */static intatoi (char *z)    /*  char *z;*/{  int i = 0;  while (*z >= '0' && *z <= '9')    i = i * 10 + (*z++ - '0');  return i;}/* I don't know of any way to pass an array to VxWorks.  This function   can be called directly from gdb.  */void vxmain (char *arg)/*char *arg;*/{  char *argv[2];  argv[0] = "";  argv[1] = arg;  main (2, argv, (char **) 0);}#else /* ! vxworks */#  include <stdio.h>#  include <stdlib.h>#endif /* ! vxworks */int main (int argc, char *argv[], char **envp)/*int argc;char *argv[], **envp;*/{    int factorial (int);#ifdef usestubs    set_debug_traps();    breakpoint();#endif#ifdef FAKEARGV    printf ("%d\n", factorial (1));#else        if (argc != 2) {	printf ("usage:  factorial <number>\n");	return 1;    } else {	printf ("%d\n", factorial (atoi (argv[1])));    }#endif    return 0;}int factorial (int value)/*int value;*/{    int  local_var;    if (value > 1) {	value *= factorial (value - 1);    }    local_var = value;    return (value);}