poj1001

请求大神帮忙找错啊，可能是漏了某种情况吧！

#include<iostream>
using namespace std;
char p[7];
int b[1001],c[1001],a[6];
int main()
{
    int n,i,j;
    while(cin>>p>>n)
    {
                for(i=0;i<=5;i++)
                 if(p[i]=='.')
                  break;
                if(n==1)
                {
                  cout<<p<<endl;
                  continue;
                }
                if(n==0)
                {
                        cout<<1<<endl;
                        continue;
                }
                int m=5-i;
                int k=0;
                int r=strlen(p);
                if(m<5-r)
                 m=5-r;
                for(i=0;i<=r-1;i++)
                 {
                     if(p[i]!='.')
                      {
                         a[k]=p[i]-'0';
                         k++;
                      }
                 }
                for(i=r;i<6;i++)
                 a[i]=0;
                m=m*n;
               k=1000;
               for(i=4;i>=0;i--)
                b[k--]=a[i];
               for(i=0;i<=995;i++)
                b[i]=0;
               n=n-1;
               while(n--)
               {
                    for(i=0;i<=1000;i++)
                     c[i]=0;
                    for(i=0;;i++)
                     if(b[i]!=0)
                       break;
                    k=i;
                    for(i=4;i>=0;i--)
                     for(j=1000;j>=k;j--)
                     {
                         c[i+j-4]+=a[i]*b[j];
                     }
                           for(i=1000;i>=0;i--)
                           {
                              if(c[i]>9);
                              {
                                    c[i-1]+=c[i]/10;
                                    c[i]=c[i]%10;
                              }   
                         }
                    for(i=0;i<=1000;i++)
                     b[i]=c[i];      
               }
               i=0;
               while(c[i]==0)
               {
                  i++;
                  if(i>1000)
                  {
                  cout<<0<<endl;break;
                  }
                  
               }
               if(i>1000)
               continue;
              for(;i<=1000-m;i++)
                    cout<<c[i];
              for(j=1000;;j--)
                if(c[j]!=0)
                  break;
             if(j>1000-m)
              cout<<".";
             for(i=1001-m;i<=j;i++)
                cout<<c[i];
             cout<<endl;
    }
    return 0;
}