#include <iostream>

 #include <cstring>

 #include <cstdio>

 #include <cstdlib>

 #include <algorithm>

 using namespace std;

 int main()

 {

     __int64 g;   //g一定要是长整形，因为数据会超int.这个也是错误的最主要原因

     int n, i;

     double a, d, x, y, sum, cnt;

     while(~scanf("%lf%lf%d", &a, &d, &n))

     {

         sum = (double)(a*);

         for(i = ; i <= n; i++)

         {

             cnt = (double)i*d;

             g =(long long)(cnt/sum); //这里一定把要转换的部分加上括号

             cnt = (double)(cnt-g*sum);

             if(cnt-a<=)

             {

                 y = ;

                 x = cnt;

             }

             else if(cnt-*a<=)

             {

                 x = a;

                 y = cnt-a;

             }

             else if(cnt-*a<=)

             {

                 x = a-(cnt-*a);

                 y = a;

             }

             else

             {

                 x = ;

                 y = a-(cnt-*a);

             }

             printf("%.10lf %.10lf\n", x, y);

         }

     }

     return ;

 }