#include<iostream>
#include<string>
#define N 500
using namespace std;
int c[N]={0};
int Length(int a[]);
void Mul(int a[],int b[]);
int main()
{
	string R,s="99.999",t="0.0";
	int n , m , i ,j , point;
	cin>>R>>n;
	if(R>=s||R<=t||n<=0||n>25)return 0;
	for(i=R.length()-1;i>=0;i--)
	{
		if(R.at(i)!='0')
		{
			i++;
			R=R.substr(0,i);
			break;
		}
	}
	int length=R.length();
	int a[N]={0},b[N]={0};
	for(i=0,j=length-2;i<length;i++,j--)//把R去小数点存入 a；
	{
		if (R.at(i)=='.')
		{
			point=i+1;
			j++;
		}
		else a[j]=b[j]=R.at(i)-48;
	}
	point=length-point;
	m=n-1;
	while(m)
	{
		Mul(a,b);
		for(i=Length(c)-1;i>=0;i--)
		{
			b[i]=c[i];
			c[i]=0;
		}
		m--;
	}
	if(Length(b)<point*n)
	{
		cout<<'.';
		for(i=point*n;i>Length(b);i--)
			cout<<0;
	}
	for(i=Length(b)-1;i>=0;i--)
	{
		if(i==(point*n-1))
		{
			cout<<".";
			point=0;
			i++;
		}
		else
			cout<<b[i];
	}
	cout<<endl;
	return 0;
}
void Mul (int a[],int b[])
{
	
	int i , j , k , x , y , z;
	int length_a=Length(a);
	int length_b=Length(b);
	for( i=0;i<length_a;i++)
	{
		for(j=0;j<length_b;j++)
		{
			x=a[i]*b[j];
			y=x/10;
			z=x%10;
			k=i+j;
			c[k]+=z;
			c[k+1]=c[k+1]+y+c[k]/10;
			c[k]=c[k]%10;
		}
	}
	k=length_a+length_b-1;
	if(c[k]==0)k--;
}
int Length(int a[])
{
	int i=N-1;
	while(!a[i]&&i>=0)
		i--;
	return i+1;
}

	

• 六次少了 (1587) frkstyc 2006-04-11 17:36:08
  • +U+U (0) Sempr 2006-04-11 17:39:06
• Re:请高手帮俺看看，我已经提交了六次了，还是错！！谢谢！ (1614) xuezhongsha 2006-05-11 13:29:29
  • Re:请高手帮俺看看，我已经提交了六次了，还是错！！谢谢！ (2) 9796 2006-05-12 10:48:44
• Re:请高手帮俺看看，我已经提交了六次了，还是错！！谢谢！ (1587) CathayBoy 2006-05-15 13:52:08
  • Re:请高手帮俺看看，我已经提交了六次了，还是错！！谢谢！ (49) CathayBoy 2006-05-15 13:54:57