Help in simple arthime...2

[mido22_sof]

spoj.pl/problems/ARITH2/
here is my code it tells me wrong answer

#include<iostream>
#include<string.h>
using namespace std;
int main()
{
 long long t;
  cin>>t;
  for(long long i=0;i<t;i++)
  {
   long long x=0,y=0,z=0,ans=0;
   char oper,oper2='-',oper3;
   cin>>x>>oper>>y>>oper3;
     if(oper=='+')
      {
       ans=x+y;
      }
     else
     if(oper=='*')
      {
       ans=x*y;
      }
     else
     if(oper=='/')
      {
       ans=x/y;
      }
       while(oper2!='=')
       {
        z=0;
         if(oper3=='=')
         break;
         else
         cin>>z>>oper2;
         if(oper2=='=')
          {
           if(oper3=='+')
            {
             ans+=z;
            }
           else
           if(oper3=='*')
            {
              ans*=z;
            }
           else
           if(oper3=='/')
            {
              ans/=z;
            }
           break;
          }
         else
          {
           if(oper3=='+')
           {
            ans+=z;
           } 
           else
           if(oper3=='*')
           {
            ans*=z;
           }
           else
           if(oper3=='/')
           {
            ans/=z;
           }
          }
    oper3=oper2;
    }
     cout<<ans<<endl;  
}
return 0;
}