View Compilation Error

0_0_37879864_25822.cpp: In function 'int main()':
0_0_37879864_25822.cpp:7:2: error: expected initializer before 'cin'
  cin>>t;
  ^
0_0_37879864_25822.cpp:9:11: error: 'op' was not declared in this scope
   cin>>n>>op;
           ^