11689 - Soda Surpler uva problem

Problem link:
This is the easy simulation of problem. just make the sum of 'e' and 'f' and play loop till (sum>=cost)
then do temp=sum/cost  and   answer+=sum then sum%=cost and now sum+=sum


if you don't understand after try then only see the code otherwise you can't improve in programming

#include<stdio.h>
int main()
{
    int e,f,c,i,j,n,t,s,sum,r;
    scanf("%d",&t);
    for(i=1;i<=t;i++)
    {
        sum=0;
        scanf("%d %d %d",&e,&f,&c);
        n=e+f;
        while(n>=c)
        {
            s=n/c;
            sum+=s;
            n%=c;
            n+=s;
        }
        printf("%d\n",sum);
    }
    return 0;
}