View Compilation Error

0_0_32649259_8964.cpp: In function 'int main()':
0_0_32649259_8964.cpp:5:2: error: '_int64' was not declared in this scope
  _int64 f[51];
  ^
0_0_32649259_8964.cpp:9:4: error: 'f' was not declared in this scope
    f[i] = 0;
    ^
0_0_32649259_8964.cpp:11:4: error: 'f' was not declared in this scope
    f[i] = 1;
    ^
0_0_32649259_8964.cpp:13:4: error: 'f' was not declared in this scope
    f[i] = f[i - 1] + f[i - 2];
    ^
0_0_32649259_8964.cpp:18:11: error: 'f' was not declared in this scope
   cout << f[n] << endl;
           ^