UVA SOLUTION: 10424 - Love Calculator

#include <iostream>
#include<cstdio>
#include<cstring>

using namespace std;
double fun(int s1,int s2)
{
    while(s1>9)
    {
        int res=0;
        while(s1)
        {
            res+=(s1%10);
            s1/=10;
        }
        s1=res;

    }
    while(s2>9)
    {
        int res=0;
        while(s2)
        {
            res+=(s2%10);
            s2/=10;
        }
        s2=res;

    }

    // cout<<s1<<" "<<s2<<endl;
    double r;
    if(s1<s2)
    {
        r=(double)s1/(double)s2;
        r*=100;
    }
    else  if(s1>s2)
    {
        r=(double)s2/(double)s1;
        r*=100;
    }
    else
    {
        r=100.00;
    }

    return r;
}

int main()
{

    string s1,s2;
    while(getline(cin,s1))
    {
         getline(cin,s2);
        int l1=s1.size();
        int l2=s2.size();
        int sum1=0,sum2=0;
        for(int i=0; i<l1; i++)
        {
            if((s1[i]>='a'&&s1[i]<='z')||(s1[i]>='A'&&s1[i]<='Z'))
            {
                if (s1[i]>='a'&&s1[i]<='z') sum1+=(s1[i]-96);
                if(s1[i]>='A'&&s1[i]<='Z') sum1+=(s1[i]-64);
            }
        }
        for(int i=0; i<l2; i++)
        {
            if((s2[i]>='a'&&s2[i]<='z')||(s2[i]>='A'&&s2[i]<='Z'))
            {
                if (s2[i]>='a'&&s2[i]<='z') sum2+=(s2[i]-96);
                if(s2[i]>='A'&&s2[i]<='Z') sum2+=(s2[i]-64);
            }
        }
        // cout<<sum1<<sum2<<endl;
        char x='%';
        double res=fun(sum1,sum2);
        printf("%.2lf %c\n",res,x);

    }


    return 0;
}