View Compilation Error

0_0_13546011_7413.cpp: In function 'int main()':
0_0_13546011_7413.cpp:6:17: error: 'c' was not declared in this scope
     while (cin>>c)
                 ^
0_0_13546011_7413.cpp:9:14: error: 'i' was not declared in this scope
         for (i=1;i<=n;i++)
              ^