#include <stdio.h>#include <stdlib.h>#define M 1.0e+256#define N 33554432Lunsigned int multiply(unsigned int n, double *result, unsigned int highest);void print(double *outdata, unsigned int highest);int main(int argc, char *argv[]){	  unsigned int i = 0, n =0, highest = 0;	  double *data;	  data = malloc(N);	  *data = 1.0;	  if(argc != 2)	   {			printf("The Parameter is wrong\n");			exit(1);	  }	  else	  {			while(*(argv[1] + i) != '\0')			{				  if((*(argv[1] + i) <= 0x39) && (*(argv[1] + i) >= 0x30))						i++;				  else				  {						printf("The Parameter is wrong\n");						exit(1);				   }			}	  }	  n = atoi(argv[1]);	  printf("The %d! = ", n);	  for(i = 2; i <= n; i++)			highest = multiply(i, data, highest);	  print(data, highest);	  free(data);	  exit(0);}unsigned int multiply(unsigned int n, double *result, unsigned int highest){	  double tmp;	  double carrier = 0.0;	  int i;	  for(i = 0; i <= highest; i++)	  {			tmp = n;			tmp *= *(result + i);			tmp += carrier;			if(tmp > 1.0e+256)			{	  carrier = tmp / M;				  *(result + i) = tmp - carrier*M;			}			else			{			      carrier = 0.0;				  *(result + i) = tmp;			}	  }	  if(carrier)			*(result + (++highest)) = carrier;	  return highest;}void print(double *outdata, unsigned int highest){	  FILE *Buff;	  unsigned  char data[32];	  unsigned char *index;	  unsigned int index1;	  if(highest == 0)			printf("%.18e", *(outdata + highest));	  else	  {	  Buff = fopen("./out", "w+");	  fprintf(Buff,"%.18e", *(outdata + highest));	  fclose(Buff);	  Buff = fopen("./out", "r");	  fread(data, sizeof(unsigned char), 32, Buff);	  printf("%.22s",data);	  index = data + 22;	  index1 = atoi(index);	  printf("%u",  index1 + highest*256);	  fclose(Buff);	  remove("./out");	  }	  printf("\n");}