View Compilation Error

0_0_19768193_27444.cpp: In function 'int main()':
0_0_19768193_27444.cpp:13:2: error: 's' was not declared in this scope
  s[0] = 0;
  ^
0_0_19768193_27444.cpp:17:2: error: 'f' was not declared in this scope
  f[0] = 0;
  ^