//CodeForces 404B
1 #include "iostream"
2 #include "cstdio"
3 #include "cstring"
4 #include "algorithm"
5 using namespace std;
6 const __int64 N = 1e6;
7 double a, d;
8 int n;
9
10 int main()
11 {
12 int i;
13 scanf("%lf%lf%d", &a, &d, &n);
14 __int64 sum = 0;
15 __int64 DN = d * N + 0.5, AN = a * N + 0.5;
16 for(i = 1; i <= n; ++i) {
17 sum += DN;
18 sum %= (AN << 2);
19 if(sum >= 3 * AN)
20 printf("0 %f\n", (double)((AN << 2) - sum) / N);
21 else if(sum >= (AN << 1))
22 printf("%lf %lf\n", (double)(3 * AN - sum) / N, (double)AN / N);
23 else if(sum >= AN)
24 printf("%lf %lf\n", (double)AN / N, (double)(sum - AN) / N);
25 else
26 printf("%lf 0\n", (double)sum / N);
27 }
28 }
