UVA10494-如果我们返回童年

#include <iostream>
#include <string>
#include <cmath>
using namespace std;
int main ()
{
string s, t, r;
char c;
long long int u = 0;
long long int v = 0;
while(cin>>s>>c>>t)
{
if(s[0]=='0'){cout<<0<<endl;continue;}
v = 0; u = 0;r.erase();
for(int i = 0; i < (int)t.size(); i++)
{
u += pow(10,i) * (t[t.size()-i-1]-'0');
}
//cout<<u<<endl;
for(int j =0; j < (int)t.size(); j++)
{
v += pow(10,j) * (s[t.size()-j-1]-'0');
}
//cout<<v<<endl;
for(int i = 0; i <= (int)s.size()-(int)t.size(); i++)
{
r += v / u + '0';
//cout<<r<<endl;
//cout<<v<<" "<<u<<endl;
if(i<(int)s.size()-(int)t.size())
v=(v%u)*10+(s[t.size()+i]-'0');
}
//cout<<c<<endl;cout<<r.size()<<endl;
if( c == '/')
{
int flag = 0;
for(int i = 0; i < (int)r.size(); i++)
{
if(r[i]!='0')
{
cout<<r[i];
flag = 1;
}
else
{
if(flag)  cout<<0;
}
}
cout<<endl;
}
if( c == '%')
{
cout<<v%u<<endl;
}
}
return 0;
}