View Compilation Error

0_0_15994617_28959.cpp: In function 'int main()':
0_0_15994617_28959.cpp:12:19: error: expected initializer before '.' token
  long long a[35],i.n;
                   ^
0_0_15994617_28959.cpp:14:6: error: 'i' was not declared in this scope
  for(i=1;i<=31;i++)a[i]=a[i-1]*3;
      ^
0_0_15994617_28959.cpp:15:13: error: 'n' was not declared in this scope
  while(cin>>n)
             ^