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 = 0;
        sum2 = 0;
        sum3 = 0;
        pos = s.find('+');
        s1.assign(s.begin(),s.begin()+pos);
        for(i = s1.length()-1; i >= 0; -- i)
        {
            sum1 = sum1*10 + s1[i]-'0';
        }
        pos1 = s.find('=');
        s2.assign(s.begin()+pos+1,s.begin()+pos1);
        for(i = s2.length()-1; i >= 0; -- i)
        {
            sum2 = sum2*10 + s2[i]-'0';
        }
        s3.assign(s.begin()+pos1+1,s.end());
        for(i = s3.length()-1; i >= 0; -- i)
        {
            sum3 = sum3*10 + s3[i]-'0';
        }
        if(sum3 == sum1 + sum2)
            cout<<"True"<<endl;
        else
            cout<<"False"<<endl;
    }
}