View Compilation Error

0_0_30294677_23945.cpp: In function 'int main()':
0_0_30294677_23945.cpp:8:5: error: 'cin' was not declared in this scope
     cin>>t;
     ^
0_0_30294677_23945.cpp:8:10: error: 't' was not declared in this scope
     cin>>t;
          ^