View Compilation Error

0_0_16593446_23299.cpp: In function 'int main()':
0_0_16593446_23299.cpp:6:38: error: 'f' was not declared in this scope
   freopen("output.txt", "w", stdout);f
                                      ^
0_0_16593446_23299.cpp:7:21: error: 'i' was not declared in this scope
   for (int i = 1; ; i++)
                     ^