有空再補上遞迴版

/***************************************************/

#include<stdlib.h>
#include<stdio.h>
main()
{
 int a,b,n;
 while(scanf("%d",&n)==1)
    {
       int temp=n;
       if(n==0) {printf("0! = 1 = 1\n");continue;}
       printf("%d! = %d",n,n);
        for(a=n-1;a>=1;a--)
           temp=temp*a,printf(" * %d",a);
       printf(" = %d\n",temp);
    }
 return 0;
}