#include<iostream>
#include<string>
using namespace std;
string BigIntegerDiv(const string &str1,const string &str2) // str1/str2
{
int i;
int length,len1,len2,len,index;
bool flag;
len1=str1.length();
len2=str2.length();
length=len1-len2;
if(length<0) return "0";
int *num1=new int[len1+1];
int *num2=new int[len2+1];
int *quotient=new int[length+2];
memset(num1,0,sizeof(int)*(len1+1));
memset(num2,0,sizeof(int)*(len2+1));
memset(quotient,0,sizeof(int)*(length+2));
for(i=len1-1,index=0;i>=0;i--)
{
num1[index++]=str1[i]-'0';
}
for(i=len2-1,index=0;i>=0;i--)
{
num2[index++]=str2[i]-'0';
}
while(true)
{
for(i=len1-1;i>=0;i--)
{
if(num1[i])
{
len1=i+1;
break;
}
if(i==0) len1=0;
}
len=len1-len2;
if(len<0) break;
flag=false;
index=0;
for(i=len1-1;i>=len;i--)
{
if(num1[i]==num2[i-len]) continue;
else if(num1[i]<num2[i-len])
{
flag=true;
break;
}
else
{
break;
}
}
if(flag) --len;
if(len<0) break;
while(++index)
{
flag=false;
for(i=len1-1;i>=len;i--)
{
if(num1[i]==num2[i-len]) continue;
else if(num1[i]<num2[i-len])
{
flag=true;
break;
}
else
{
break;
}
}
if(flag)
{
--index;
break;
}
for(i=len;i<len1;i++)
{
num1[i]-=num2[i-len];
if(num1[i]<0)
{
num1[i]+=10;
--num1[i+1];
}
}
}
if(index==0) break;
else quotient[len]=index;
}
string ans;
flag=false;
for(i=length;i>=0;i--)
{
if(flag||quotient[i])
{
flag=true;
ans+='0'+quotient[i];
}
}
if(!flag) ans="0";
delete [] num1;
delete [] num2;
delete [] quotient;
return ans;
}
int main()
{
string str,str1,str2;
while(cin>>str1>>str2)
{
str=BigIntegerDiv(str1,str2);
cout<<str<<endl;
}
return 0;
}
posted on 2011-07-31 15:22
wuxu 阅读(946)
评论(0) 编辑 收藏 引用 所属分类:
高精度