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哪错了??

Posted by 976423215 at 2011-04-18 22:50:12 on Problem 3982
#include<iostream>
#include<string>
#include<fstream>
using namespace std;
 string add(string &s1,string &s2)
 {
	string s3,s="";
	int f=0;
	int a,b;
	char c;int i,k;
	if(s2.size ()>s1.size ())
	{
		s3=s1;
		s1=s2;
		s2=s3;
	}
	for(i=s2.size ()-1,k=s1.size ()-1;i>=0;i--,k--)
	{
		a=s1[k]-'0';
		b=s2[i]-'0';
		if(a+b+f>=10)
		{
			c=a+b+f-10+'0';
			s=c+s;
			f=1;
		}
		else
		{
			c=a+b+f+'0';
			s=c+s;
			f=0;
		}
	}
	for(;k>=0;k--)
	{
		a=s1[k]-'0';
		if(a+f>=10)
		{
			c=a+f-10+'0';
			s=c+s;
			f=1;
		}
		else
		{
			c=a+f+'0';
			s=c+s;
			f=0;
		}
	}
	if(f==1)
	{
		c=f+'0';
		s=c+s;
	}
	return s;
}
int main()
{
		string s[100];
	while(cin>>s[0]>>s[1]>>s[2])
	{
		for(int i=3;i<=99;i++)
		{
			s[i]=add(s[i-1],s[i-2]);
			s[i]=add(s[i],s[i-3]);
		}
		cout<<s[99]<<endl;
	}
	system("pause");
	return 0;
}

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