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头疼啊!这个是什么问题啊!我试了很多,但是,还是不知道 wrong的原因!

Posted by plumage at 2005-04-28 19:05:57 on Problem 1001
#include<iostream.h>
#include<fstream.h>


//#decine length 6 95123
#define distingish 48
unsigned int result[151];//the result of computation
unsigned int temp_forStore[151];
void main()
{
//	fstream cin("in.txt",ios::in||ios::out);
//	fstream fout("out.txt",ios::out);
	char input[7];//Rn where R 
	int real[7];// R is a real number ( 0.0 < R < 99.999 ) 
	int point=0;
	real[0]=6;
	int n;//n is an integer such that 0 < n <= 25
	cin>>input>>n;
 
	int i,j,k;
/**/
	for(i=0;i<6;i++)//initialize the point
	{
		if(input[i]=='.')
		{
			point=5-i;
			real[0]--;
			for(j=i+1;j<6;j++)
				input[j-1]=input[j];
			break;
		}
	}

	for(i=real[0]-1;i>=0;i--)
	{
		if(input[i]=='0')
		{
			real[0]--;
			point--;
		}
		else
			break;
	}
 

	point*=n;
	for(j=1;j<=real[0];j++)
	{
		real[j]=input[real[0]-j]-distingish;
		result[j]=real[j];//initialize the temp_forStore[]
	}

	result[0]=real[0];//the number of digits in temp_forStore[] presently
 
	unsigned int product;

	for(i=1;i<n;i++)//times for producting the real[]
	{
		for(j=1;j<=real[0];j++)
		{
			 for(k=1;k<=result[0];k++)
			 {
				 product=result[k]*real[j];
				 temp_forStore[k+j-1]+=product;
				 temp_forStore[k+j]+=temp_forStore[k+j-1]/10;	
				 temp_forStore[k+j-1]%=10;
				 
			 }//end temp_forStore[]
		}//end real[]
		for(k+=j;k>0;k--)
			if(temp_forStore[k]!=0)
				break;
 
		temp_forStore[0]=k;
		//copy the temp_forStore[] to result[]
		for(;k>=0;k--)
		{
			result[k]=temp_forStore[k];
			temp_forStore[k]=0;

		}

	}//end n
 
 	if(result[0]>point)
		i=result[0];
	else
		i=point;
		
 

		for(;i>0;i--)
		{		
			if(i==point)
				cout<<'.';		
			cout<<result[i];
		}
	cout<<endl;
}

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