POJ 2572

 #include<stdio.h>
 #include<iostream>
 #include<string>
 using namespace std;

 int main()
 {
     //freopen("acm.acm","r",stdin);
     string s;
     int pos;
     int pos1;
     string s1;
     string s2;
     string s3;
     int i;
     int sum1;
     int sum2;
     int sum3;
     while(cin>>s)
     {
         sum1 = ;
         sum2 = ;
         sum3 = ;
         pos = s.find('+');
         s1.assign(s.begin(),s.begin()+pos);
         for(i = s1.length()-; i >= ; -- i)
         {
             sum1 = sum1* + s1[i]-'';
         }
         pos1 = s.find('=');
         s2.assign(s.begin()+pos+,s.begin()+pos1);
         for(i = s2.length()-; i >= ; -- i)
         {
             sum2 = sum2* + s2[i]-'';
         }
         s3.assign(s.begin()+pos1+,s.end());
         for(i = s3.length()-; i >= ; -- i)
         {
             sum3 = sum3* + s3[i]-'';
         }
         if(sum3 == sum1 + sum2)
             cout<<"True"<<endl;
         else
             cout<<"False"<<endl;
     }
 }