OJ 1242 freshman's debut

describe

Four years ago today , You are thinking about where and what kind of university I should go , You think you can learn …, The result is very lucky to come to Zhejiang University of traditional Chinese Medicine , Ah , Now that it's here , That's not bullshit , At this time, you should be able to help me calculate A+B. Here you are, you two , You add the odd digits of the first number and the even digits of the second number to get a number , Then add the even digits of the first number and the odd digits of the second number to get a number , Then output the sum of these two newly obtained numbers .

Input
Enter two numbers A,B《 The scope does not exceed long long 》

Output
Output the above and

sample input 1 

123
456
sample output 1

21

The title says odd and even digits , It is relatively troublesome to directly use integers , Sure Use string , Traversal string , Through this traversal, you only need to cycle to find odd and even digits .
 

#include <iostream>

using namespace std;

int main()
{
    string a,b;

    while(cin>>a>>b)
    {
        long long sum1=0,sum2=0;
        for(int i=0; i<a.size(); i++)
        {
            if(i%2==0)
                sum1=sum1+a[i]-'0';
            else
                sum2=sum2+a[i]-'0';
        }
        for(int i=0; i<b.size(); i++)
        {
            if(i%2!=0)
                sum1=sum1+b[i]-'0';
            else
                sum2=sum2+b[i]-'0';
        }

        cout<<sum1+sum2<<endl;
    }
    return 0;
}