View Compilation Error

0_0_28241187_1226.cpp: In function 'int main()':
0_0_28241187_1226.cpp:15:5: error: 'cin' was not declared in this scope
     cin>>t;
     ^
0_0_28241187_1226.cpp:44:9: error: 'cout' was not declared in this scope
         cout<<endl;
         ^
0_0_28241187_1226.cpp:44:15: error: 'endl' was not declared in this scope
         cout<<endl;
               ^